For my gigging acoustics I'll change them out about every 3 gigs and that equals about 12 hours of playing. I've let some sets stay on guitars for years, especially electrics. You can do so much to process the tone of an electric guitar that string life can have very little to do with the final tone in the long run. There's also a part of me that enjoys playing 'dead' strings on electrics too.
My fingers are also very acidic. I'll post a pic later today of how black my fingers can get while playing guitar.
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