I would change mine yearly just because I wanted to. Sometimes I kept them on a little longer. I just replace mine this year and the set that came off was almost 4 years old. Like Dale stated above, as long as there are no cut in the String or Cable no longer than 3 years. The last set I had on I waited a little to long and you could tell the difference when I changed them out, made a big difference in performance.
What you should do is get a new string, peep, scilencers/ whatever else is on your string now. Set it up tune it and use that string as you will probably need a new one fairly soon anyway. When they take your old string/cables off don't let them untwist them! Take them off, keep them from untwisting and put a paperclip in both loops so it can't untwist! That way you have a completely set up string you can just slap on in a pinch without having to worry too much about tuning/peep placement. :twocents: it would be a pain to have to put a brand new string on and completely set it up in the back country.
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