Mike Ash writes:

The *engines turning* drains the fuel from the tanks. In other words
there is a strict time limit on all of these activities.

That time limit is not changed by incapacitation of the pilots.

Airports don't keep instructors sitting around on call ready to leap
into action at a moment's notice the way they do S&R, firemen, and
military interceptors.

They don't have to be on call.