Rest Untill Healed basicly is you sleep 8 hour For 1 hp(plus constitution Modifiers) but your clerics will cast theire healing spells so it takes less time for the healing to be compleated.
the time to re-memorise the spells once done so it taggs on an extra 8 hours.
I personaly do't like rest until healed, I prefer to keep it simple and sleep more if needed.
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