Youre right. Also the sides of the bed don’t match up. The far side meets all the way at the bumper. The near side meets before the bumper and then continues on level with it before connecting.

Moon is tidally locked to the earth. So its day length is the same as it’s orbit. That’s 29.5 earth days which (using the logic you supplied) means that a lunar hour is approx 1.23 earth days.