Defensive players alot of time will not mature and be productive long term untill 5 years. Alot of guys that are studs early are duds after 5 yrs. RB,s however are immediate. Seldom does a star RB emerge after 3 yrs. If you look at WR stats some guys start getting 60+ rec and 750+ yds right away and hold that pace some guys like Harrison and Bruce take 3 or 4. IMO RB's immediate, QB's 2-3 , WR's 4-5, and Defense 6-7 overall I would say 8 years.
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