Yeh I tend to change strings every 1 to 2 weeks, if I can afford it and have the time to get to the local music store of course. My strings get very dirty, very quickly because I play at least 1 hour every day.. and I always forget to wash my hands before playing. The only exception is my acoustic which I prefer to have a duller sound than a very bright, brand new strings sound. I might change my acoustic strings every 6 to 12 months.