If I'm playing twice a week, moderate swing speed, lots of spin on my serve. I bought the Gamma X-2 last year and have pretty much used up all the strings that came with it. The Gamma string is all I've tried so far. This winter I've only played a couple times each month. My racquet may sit for 2 months between stringing. I say this since if I string one racquet I'll play it until the string starts to move too often. The other racquet may not have seen daylight in quite a while. Seems I'm spoiled with the stringer and "free" string so I find myself re-stringing about every third time I play. Am I shorting myself playing time with the string? Am I going too long? I usually "feel" the string differently after the third time using it. I've only broke string 3 times in the last year so I'm not a huge hitter by all means.