Well with a joint then if your going to just sit there holding your breath and letting the jay burn then I would consider the hit over about 2 seconds after they took the toke, why should we wait 5 seconds for them to exhale when they can just simply pass when their done with it?

With a bong then I don't mind if someone sort of double tokes to clear the chamber, cause if that smoke is considered a hit, then it sure as hell ain't fair to pass it and have someone just get a stale hit and pass it.