I just wondered if you guys replaced your string every year?

I build 2 strings for my bow and shoot in each w/ at least 500 shots. That gives me 3 strings (factory string also) and I replace them as they become worn which is about 6 months of shooting.......Much to my wife' s dismay, I' ve never owned a bow long enough to put the 3rd string on.....I like having extra strings around just in case!