Badminton rackets.

Exactly the same as tennis rackets, there is a 'general rule of thumb' thought about how often you should re-string your badminton racket.

So for example if you are a club player playing competition tennis and play 3 times per week - you should consider re-stinging 3 times per year.

For somebody playing social tennis say, twice per week - re-string 2 times per year.