I've got 133IP out of a 32/96 RP. 84 appearances.
I used him as a setup B, 6th IP. 1 pull rating. He could have gone more, but I had another really good RP I used as a setup A , (8th) who ended up with 102 IP.
I put everyone else in long B to ensure these guys were used whenever the game was remotely close, but if you have other good RP, that might not be the best idea.
Also, in the national league, he may get pich hit for, which will limit his innings a bit, but probably inflate his appearances.
Having a guy like that is key to going with an 11 man staff.