I ran a set for almost 10 years on my fretless, which was a bit too long. They actually developed flat spots in the tape covering from overuse. Heck at $20-ish per set it may be good idea to swap 'em out every year or two just to be on the safe side.
No Ma'am, I'm not as talented as the other guitarist in the band. That's why he gets six strings and I only get four.