I change mine about once a year, but I generally only play acoustic these days at Sunday night church service. And I use Cleartone strings, they last a long time.I'd use that in less than a year.
Who the heck changes the strings on their acoustics so much that they need a 12 pack of them ???
Is your name Tommy Emmanuel? Leo Kottke? No? Then you don't need 12 packs of strings. They will go bad before you ever use them up
Have you tried Cleartone strings, @baimun ?
I swear they last alot longer, with better tone, than regular strings. Which is why I only change mine about once a year. Of course, I don't play outdoor gigs in 90 degree weather and sweat all over my strings...