How often do basketball teams change there jerseys every 2 years every season ?

I dont think its very often, I think they have to ask the league 2 years in advance before they can change or something like that.

Its just like the NFL really. They change them when they're bored of them, so some keep them for years and some change fairly often. I think it has to be a minimum of 2yrs though.

Teams seem to change sometimes when they draft a good player - kind of a sort of relaunch. The Cleveland Cavaliers and Denver Nuggets did it when they got Lebron James and Carmelo Anthony after years of being crap