philreed said:It's the exact same problem I have with the X/day system. No matter what, all of these are arbitrary decisions. In my opinion, this type of mechanic should be designed around whatever makes things the most playable.
A fatigue system, in which characters must recover after using abilities, may work.
Iron Heroes token system could model recovery easily. Earn one token per hour. Once you reach max tokens, that's it. Use your special power, burn 1 or more tokens (maybe all of them). Can't use ability again until tokens are maxed. This might be one mechanic where having a low Maximum, would be a good thing. Might want to consider a way to shift the logic so big is good.