How long should I wait to plug in my refrigerator after unplugging it?
There's 2 reasons to wait after moving a refigerator.

If you tipped it over the oil needs to re-settle in the compressor.

If you interrupted a run cycle the compressor may not be able to re-start, as the motor has a low starting torque and starts more easily working into a low pressure difference - ie after a little rest.

In the first case wait a few hours. In the second case 5 minutes is plenty, or you can ignore it and the thermal cut-out will enforce the wait if needed.