@richardy Wash and fold is where the money is. I owned for about 4 years. It just got to be too much with out enough financial reward. You definitely have to go at least once a day sometimes more.
If you are going to have an attendant you need at least 2, probably three or more (different shifts, how busy they are with w&f, days off- this can effect the hours you are open as well). That adds a layer of extras... Payroll, ui, workers comp...
If you're not able to fix the machines on your own it can get expensive real quick-cutting into profits big time. Replacing the machines is quite expensive as well (make sure you know the age of the machines, their expected lifespan, if they're owned/leased and terms of lease before you buy).
Also if you're going to sell things like laundry bags, detergent, drinks, snacks, etc you need to get a resellers license... And do all the reporting, etc that goes along with that.
I personally don't think it's an absentee business, especially as someone new to the industry. It's the best if you own the property and are not renting (that was my biggest expense, by far) I also feel like you need at least three locations to make it your main source of income.