We turn it off between uses. It goes on in the morning, then off most of the day. During the day it will stay hot enough to wash a few dishes, etc. It's always off overnight but heats quickly in the morning.
We also turn off the pump when we will be away from camp for a while. It's for safety; if a valve fails or a faucet is not quite turned all the way off, there's the possibility of flooding. When hooked up to an outside water supply, the grey tank would fill then overflow and flood the trailer. It wouldn't be as bad if the fresh water tank was being used but even that much water could flood. We turn the pump off at night too. That's to avoid having the pump go on in the middle of one of those cold nights, not that the pump runs for a long time but it will pop on in a little "burp" once in while as the water cools. Irritating.