Following on from the `What Strings' thread, I'm wondering how often & why you replace strings.
I know this depends on many things, but until recently, I only played guitars with Floyd Rose trems and the snapping of the top E dictated when I replaced strings. I would get about 8 weeks max use out of a set and this was playing for 5-10 hours per week. In summer months, with sweaty hands and bad care, I have gotten through a set in 2 weeks.
These days I'm playing my Strat & Explorer and I can see strings lasing considerably longer. As I'm not in a band at the moment, I see no point in changing them in case they snap.