I get about 36 hours of play out of the Gosen Micro before I start feeling a change. I can usually go another 10 or 12 before I feel the need to change it out. The Zo Verve seems to last a lot longer. I am actually impressed that the thin Gosen (18g) string doesn't seem to break as often as the 17g I was using. I am guessing that the lower tension is a factor. When I was up in the 60's and 70's, I tended to break at least one string per month. I am playing a lot more now, and rarely break a string.