That's if you don't have to adjust it, otherwise it becomes:-
Try closing it, too easy, tighten a couple of revolutions, try closing again, still a bit too loose, spin one more revolution, tiny bit too tight, loosen slightly on the nut side, close QR, done.
That can easily take 10 seconds or so, still better than rummaging around for a spanner or an allen key or even a pitlock key.