It has to do with number of wins and overall achievement. Getting to D-II is easy, win 6 games at DIII and there are plenty of teams (not good ones mind you) open in DII. That's the only measurable that I know of. I don't think it is possible in 5 seasons unless you won the NC in DIII, DII, and DIAA in those 5 seasons. I'd bank on between 8 and 10 as minimum if you are racking up wins fast.