yes, 3-5 years sounds right to me as well.
i think ainge will use the draft to build, but make at least one big trade to bring in a star - ala KG and ray trades.
the question is when he would make this trade? i dont see it happening until wallace is waving goodbye to the celtics, so such a trade may be 2 years away.
if i were not both busy and lazy i would review the rosters of other teams, see who will probably suck in 2-3 years, AND has a super star they might package for a herd of young players. that is about as close to a crystal ball as i can summon up at the moment.