I fill my rosters with players with low 20 dur and low 60 stam and I typically approach 200 Ips for them, usually just falling short. I set them on 70-75 pitch counts and more often than not they are ready to go in a 4 man rotation. Every now and then I need a 5th starter.
They will typically last 4-6 innings so you will get a long reliever who steals all their wins. I have a guy who won 20 games out of the pen last year and this year with 20 games left hes already at 25 wins while my starters sit around 8-11 wins.