How often should you change the strings on an acoustic guitar?

I have heard you should be able to expect anywhere from 12 hours of play and up depending on what types of strings. Now 12 hours of play isn’t very much. If you play 2 hours a day that’s once a week you would have to change your strings. Basically what that time means is after 12 hours of play the strings will start to lose their initial tone. So I wouldn't worry about it unless it starts sounding differently than usual.

The important thing is to have a good enough ear, to tell when strings are not at their best. If your ear is not that good, it is not time to worry yet. You should always have on hand 2 or 3 spare sets of strings, in case strings break or loose their quality. Good Luck

There's no set schedule. When they start going dull, or when one breaks, that's about time to do it. I shoot for every 2-3 months. Some people do it much more often, or less.

you should depend on your ear to see when they start sounding a bit "off" although if not change them every 2-3 months

like every 3 months