i think they're 24/7. You have to be able to get your car out any time, day or night.
When we stay deluxe, we always use the valet service.
or maybe it's only 24/7 to get your car out, but not to put it in?
I don't know. But when we've had to take our car out very early in the morning to get to the airport, we've never had a problem.
I suggest you call the deluxe hotel you're interested in and ask them.