It’s not the first time I had heard something similar. I never really believed it but I believe the guy I was talking to. I think he was exaggerating a bit about three years to prove a point that you could get away with not doing it for that period of time. Here is a video that says similar to what he told me. He stated 3-4 months which I feel is pretty reasonable.If this is the information that you are getting it’s time to find a different bow shop