What it sounds like to me is there are three tiers:
1. 10+ has their normal ratings for the entire time until they are tired; how fast they get tired depends on their actual endurance rating.
2. 5-9 will lose effectiveness prior to actually getting tired. These pitchers can pitch multiple days in a short period of time, but they can't pitch too long on one day without losing some stuff.
3. 1-4 can't throw many pitches without getting tired. These pitchers have difficulty pitching back to back days.
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