How Many Hours Should You Play Before Replacing Your Tennis Strings?
Choosing a tennis racket can be exciting, especially if it’s your first one. Price, brand, weight, how it feels in your hand—there are plenty of details to weigh up. Once you’ve bought it, there’s a sense of relief. Then, after a while, things start to change: the way the ball leaves the racket, your sense of control, and the response you get at contact. When that happens, it may not always be down to you. Buying a tennis racket isn’t the end of looking after your equipment. You also need to check its strings regularly and replace them when needed. And you don’t have to wait for a string to break. Especially with polyester, resistance to breakage and the ability to maintain a good playing feel are two different things.
If you use polyester strings, you can treat roughly 10–20 hours of court time as a window for checking them more closely and planning when to restring. That doesn’t mean you must replace them every 20 hours. But looking intact isn’t enough on its own, either. You need to consider playing feel, wear, and total use together. Applying that same hourly range directly to other string types wouldn’t be the right approach.
First, what strings are in your racket?
Tennis strings may look similar, but they don’t all age in the same way. Before borrowing someone else’s restringing schedule, you need to know what you’re using. If you’re unsure, ask the shop where you bought your racket or the stringer who restrings it.
| String type | How should you assess when to replace it? |
|---|---|
| Polyester / co-polyester | Use roughly 10–20 hours of play as a monitoring window. If the playing feel deteriorates sooner, don’t wait for that point. |
| Multifilament | Rather than relying on a single hourly limit, watch for increasing fraying, noticeable thinning, and changes in feel at contact. |
| Synthetic gut | Consider wear, control, and the feel of the tension alongside playing time. |
| Natural gut | Can hold tension well. Keep an eye on physical wear and any effects of moisture. |
| Hybrid setup | Two different strings are used together. Assess the setup as a whole rather than judging it by whichever string looks more durable. |
The range given for polyester is more about how long it maintains its playing characteristics than when it will break. String manufacturer reString also explains the 10–20-hour range in those terms. Tennis Warehouse University notes that players report the feeling of strings “going dead,” particularly polyester, after different amounts of use. So even if you and a friend use the same string, you may not need to replace it at the same time. How you play and how much you play are part of the calculation, too.
Why replace polyester strings before they break?
Replacing a string that looks intact can seem unnecessary at first. After all, nothing has snapped. But the control and spin potential polyester can offer the right player don’t necessarily stay at the same level until the string breaks. With use, tension loss and wear where the strings touch one another can change how the stringbed responds. The stringbed is simply the hitting surface formed by the strings inside your racket. These changes can also affect how the strings slide sideways during a shot and return to their original position. That return movement is called “snapback.”
When players say their strings have “gone dead,” they generally mean they’re no longer getting the response they’re used to. Some say the ball leaves the racket with less control; others find it harder to get depth as easily as before. In other words, ageing strings won’t always announce themselves in the same way. Especially if you use polyester, “I’ll keep playing until it breaks” isn’t a sufficient maintenance approach on its own.
What does 10–20 hours look like in your schedule?
We’re not talking about the time your racket spends sitting in your bag. We mean roughly how long you spend playing on court. You don’t need to count every second of ball contact, either. Logging your sessions consistently is enough. For example, if you play twice a week for an hour and a half each time, that adds up to three hours a week. At that pace, you’ll reach:
- 10 hours of use in roughly 3–4 weeks.
- 20 hours of use in roughly 6–7 weeks.
This gives you an idea of when to assess your polyester strings more closely. It isn’t an automatic instruction to think, “Six weeks are up, so I have to restring.” Hard hitting, heavy topspin, the string model, its thickness, and the initial tension can all affect the timing.
How can you tell it may be time to restring?
1. Your usual shots start giving you a different response
If you’re playing in similar conditions but the way the ball comes off the racket consistently feels different, it’s worth checking your strings. Having to keep adjusting your swing to land a shot you previously found comfortable is also worth paying attention to.
Of course, strings aren’t responsible for every ball that sails out. Old balls, wind, fatigue, and technique can affect the result, too. Rather than making a decision after one bad set, look for changes that keep showing up across several sessions.
2. Noticeable grooves appear where the strings cross
As strings rub against one another, small notches can develop at the contact points. Increasingly visible grooves, along with strings that struggle to return to position after moving, are signs to watch for, particularly with polyester.
You can gently move a string sideways with your finger, release it, and see how it behaves. But don’t treat this as a definitive test on its own. String type and setup also affect that movement. Consider what you see alongside how the racket feels during play.
3. Wear becomes more obvious on multifilament strings
Over time, multifilament strings can develop surface fraying—a slightly fuzzy appearance. Seeing that doesn’t automatically mean they’ve reached the end of their useful life.
However, if noticeable thinning, substantial fibre loss, and a change in playing feel occur together, it’s worth having them checked. Don’t expect multifilament to show exactly the same signs as polyester. Different materials can show wear in different ways.
4. Contact doesn’t feel as comfortable as it used to
If hitting the ball no longer feels as comfortable as you’re used to, have your racket and strings checked. But don’t assume new or persistent pain is caused by the strings. Rather than continuing to play through pain, you need to assess what’s causing it. A fresh set of strings doesn’t mean every discomfort will resolve itself.
Is the “restring as many times a year as you play per week” rule reliable?
You may have heard this advice when you started playing tennis. The idea is simple: if you play twice a week, you’re told to restring twice a year. It’s memorable as a general starting point. But two short practice sessions a week don’t amount to the same use as two long matches. The calculation doesn’t account for your string type, either.
When Tennis Warehouse shares this rule, it notes that polyester users may need to restring more often. Babolat’s general guidance for maintaining performance mentions restringing at least every three months.
So these recommendations shouldn’t be treated as one fixed schedule everyone has to follow. A calendar can remind you when to check; playing time, string condition, and playing feel should guide the replacement decision together. Especially if you regularly use polyester, don’t rely solely on an annual restringing count.
Do strings still age if you don’t play much?
If you don’t play tennis very often, you might think, “I barely use them, so they’ll be fine.” But strings can lose tension over time even when they’re not being used. That means you shouldn’t assume a racket that’s spent months in a bag will respond exactly as it did the last time you played.
Where you store your racket matters, too. A hot car boot and direct sunlight aren’t suitable conditions for strings. It’s best to keep your racket away from extreme heat and large temperature changes where possible. If you use natural gut, you also need to be careful about moisture. If you’re returning to the court after a long break, check the strings first. If you don’t know when the racket was strung or which string was used, having a stringer check it is a sensible place to start.
How do you find your own restringing interval?
A quick note on your phone is enough to avoid asking, “How long have these strings been in here?” every time. You don’t need a detailed training spreadsheet. Recording these details will make things easier:
- String brand, model, and thickness: You’ll know what you were using when it’s time to restring.
- Stringing date and tension: You can track both the time that’s passed and your previous setup.
- Approximate court time: Add the length of each session to your running total.
- When you first notice a difference: Make a quick note when control, comfort, or the way the ball leaves the racket changes.
Using the same string and tension for your next restring can make it easier to notice the difference between the old and new strings. If you change the string, tension, and racket all at once, it becomes harder to tell what caused which change.
After a few restrings, an interval that suits your own use should become clearer. If you need to replace your strings very frequently, don’t look only for a thicker string as the solution. Talk to your stringer about whether your string type suits your game, your expectations, and your maintenance habits.
When choosing a racket, you look at its weight, balance, and how it feels in your hand. Its strings need similar attention throughout their use. Because still being in place doesn’t mean they’re still working the way they did on day one.