How often

should I change my uke strings?
I haven't replaced them since I got the uke. [over a year ago]

thanks in advance

When they start to sound dull, change them. Usually every two to three months.

My method is simple. The first time I ask myself "I wonder if I should change these strings?..." I just change 'em.

The exception is just before recording or performance. I tend to do those swaps at least a day or two in advance to aviod string stretching issues making me crazy.

Nylon strings can go a surprisingly long time without a change, but that doesn't mean they should. A large percentage of some of the most basic uke issues (intonation, buzz, volume, etc...) can be fixed with a simple string swap.

When in doubt, slap a new set on.