My answer is an emphatic NO!
I don't think stands should be allowed to be left anytime, even during midday.
My friend and I were hunting a WMA this past weekend, and someone dropped off a hunter right where he parked and went in. It's blatantly obvious where my buddy would be hunting because of the terrain, so seeing his vehicle there should have been a clue to anyone with at least a room temperature I.Q.
So the guy comes within 75 yards and climbs up 45 minutes after daylight.
He'd left his stand overnight and felt like he'd claimed the spot, then showed up very late, but no one had a clue he had left it.
Pretty much a Jerk move.