I give my starters 2 starts but I leave my position players in all lineups but they come out after 3 or 4 innings or so. So most will play throughout ST. And the bench guy and top prospects get theirs as well.

I usually try to get veteran position players (Age 27+) 15 plate appearances, and prospect position players (Age < 27) 30 plate appearances. I usually try get get veteran pitchers (Age 29+) 5 IPs, and prospect pitchers (Age < 29) 10 IPs. I usually to to get all of this done in the first 12 games of ST, and then rest my major league roster players for the final 6 games of ST.

I don't like to play my regulars too much in ST because I don't want to subject them to the possibility of injury. Nothing is worse than getting a key player injued in meaningless games. I'll put up with a possible ratings point drop here or there rather than get the really bad loss due to injury.