You could probably go with 2 RP's from 1871-1910. I may update this. I do not suggest going less than that though because of game with extra innings, nor do you want a singe RP having to be used in every game in OOTP as they will perform very poorly.
As for having rotations beyond what I have recommended you will find that you simply do not have enough SP's in the league to make that work and end up with pitchers with 10 stamina in your rotation. Those guys will throw 4-5 IP per start and perform very poorly.
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