Thanks for the reply - makes sense.Classic/AD&D you just put spells in the slots and go - and the daily loadout only needs changing occasionally.
5e adds various bells and whistles to casters, enough that it'd be a pain.
In AD&D 1st ed it is 1 week (unless Heal is used).it's not just a sleep, but it's not a week either. It's a day of bed rest.
In that earlier version, there's also another wrinkle which I think may often have been ignored: the character dies if dropped below 0 hp (optionally -3); so the -10 buffer is there only for allowing the dying character to be saved. It is not a buffer as far as damage from attacks or spells are concerned.
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