system
A chat on subreddit /r/NoStupidQuestions
human
Family of four, I wash the dishes in the sink daily even though we have a dishwasher. 

I looked up the specs and the dishwasher uses 4 gallons of water an hour. The sink is a 4 gallon sink. The dishwasher cycle is 45 minutes. Once you add the rinsing water to the cycle you're probably at 4 gallons anyway. Plus some dishes have to go through two cycles to get properly clean. 

It take me about 35 mins most nights to wash up. All in, it's probably about equal. But washing up doesn't bother me, in fact it's quite therapeutic.
gpt
You must have a very old dishwasher because modern dishwashers quote water usage per cycle and not per hour.
These figures are also around 2 gallons per cycle.