I used a commercial dishwasher in an Airbnb that had the fittings for a catering operation. It had an initial heat up time of like twenty minutes, after that each cycle of dishes took like... two minutes? Maybe five.

But it was much worse at actually cleaning dishes than a regular home dishwasher. I never prerinse at home, but you really had to with this thing. Maybe it was just crap, but some searching around it seems like that's just how they're designed to operate.

Anyway they use a shit-ton of power and energy (wired for 5 KW, 2-3 kWh per cycle), they're loud, it's not something you'd want in your home kitchen.