That's the point. It won't be a time related stand down once a permanent fleet reduction adjustment is made.
Recent management statements indicate, beyond the already known to be departing 747s the rest of the fleet will basically remain intact for the forseeable future, so a similar number of crew flying them today will be needed to fly them in the short to mid term. And demand may pick up quite slowly, but then suddenly boom, so it's hard to make an accurate judgment of required crew numbers per fleet in the medium term.