How long should a successful rebuild take?

My thought is this with our Cap situation things are a bit different. A 1 year turnaround isn't going to happen unless we find Payton 2.0 as HC. You use the next 2 years to build up a core and find a QB. 3rd year you can sign some free agents and maybe contend for the play offs. 4th is when you really see what you got. Sadly Mickey is our GM and has no talent for finding players. And much to our chagrin we won't be finding a QB in this draft.