Will a battery-powered camp shower drain a 5-gallon bucket too fast?

This is the most common complaint across r/camping and r/CampingGear threads. Higher-pressure rechargeable pumps can empty a 5-gallon bucket in just a few minutes if you leave them running. Reviewers recommend starting and stopping the flow, or choosing a unit with adjustable pressure modes (the Spopal and the newer 8000mAh-class pumps offer this) so you can throttle down for rinse-and-repeat.