Q: How long are the effects of Command spells valid for? For example, when a Servant with no healing skills is dying, what happens after "heal right this instant" instruction? (Ehime/MidoriSansen)

A: If there is no treatment skills, the body will remain "reluctant to move" in it's seriously injured state. The wound would temporarily sewed shut with a thread of magical energy.
Of course, as soon as the potency of command spells is exhausted, it will take more damage before use.
Because the wound is not healed, there is pain during activities, ability is also reduced.
Shall we say in a temporary "zombie" state.

Comptiq 2007 Issue 12; Fate Dojo Q&A