I've played for six years and it's always been the case that I just change my strings when they snap. I've always used polly. Just for reference I'm about a high 4.0 player, playing 2 hours a day 4-5 days a week. The thing is, my strings last me usually at least two months. I just read that they should be changed like every 10 hours or so though, which would be insanely different for me. What are the pros/cons to changing/waiting with regards to strings? And dunno if it matters but I have I MSV co-focus strings and a PDR.