I wouldnt go to much more then two years if you dont shoot to much. Having a bow come apart is bad news. I replace mine every year but I shoot a lot, we will see how long these strings last. Big thing is to maintain your strings by cleaning and waxing them. Watch the serving for seperation which can lead to failer if the string wears. Ive been hearing 2000 shots but thats maintained ive seen string fail quickly..