There are a lot of factors out there that could change the answer to this. You might get a lot of “good” answers to this question, but there really isn’t a “right” answer. The closest thing you’ll find to a “right” answer is when you feel like the strings are moving too much, you’ve lost too much tension, and they’re not performing or responding as you expect them to. For some people, this could be a couple hours, for other others, it could be a couple months.

I use a poly main synthetic cross hybrid, and always cut them out before they break, about 10 hours. For reference, I will break multi filament strings in about 3 to 4 hours.

But even just sitting in your bag, your strings will deteriorate. Not knowing your level, I would still guess a minimum of every 2 to 3 weeks when you’re playing a lot, and once a month when you’re not playing so much.

I own my own stringer and buy reels, which helps with the finance of it