In the past I changed my string every spring....Actually I'd immediately take the factory string off my new bow and replace it with one of my own. When I sold that bow the next year, I'd put the factory string back on it.

With today bows depending on how much you truly shoot it, how you care for it you can get away with two seasons, if you check it, measure etc tune you bow...however,

regarding your bow brown boy09...you should have changed it before this season, now you should wait and change them after this season.