All day? LOL Seriously, I've never run across anybody wanting to spend that kind of money, I wish. People will typically break those jobs up into smaller, more affordable chunks. My pricing for is set up to end up being $70-75/hour when there's two of us on the truck, when I'm by myself it works out to $50-55. For example, if we're there for four hours, the charge is going to be right around $300. There's SO MUCH competition here that if you price yourself any higher you won't book many jobs.
As an example, yesterday, we had two washes first thing in the morning (maintenance, every other Saturday). 1:45 and they paid $120 (they don't tip ever, they don't even talk to us. The cars are in the driveway, the keys are in them and a check is on the seat). Then we went and did a full exterior detail, spot cleaned a few interior stains and headlight restoration. The vehicle was a 2011 Cadillac SRX in pretty awesome shape. Total time was 2:30. She paid $225 with tip. Our last job was two mini details which is wash and wax on two Cadillac CT6s we regularly maintain with no set appointments. They paid $175 with tip. Time on that job ~2:15 but we spend a lot of time talking to the wife because she's super nice and pretty attractive. So $520 yesterday in 6:30 of working time, not including travel, works out to $80/hour which is right where I like to keep the truck rate after tips. Total travel time was probably 45 minutes as our first and last job were really close to home.
Those are typical of the jobs we get. Some people might say I'm a car washer, but my average ticket is a little north of $150. A lot of the guys I know in this business say they do 85% washes for under $50. I've had four tickets under $60 in the last two weeks, one was a paint transfer removal on a bumper that took me 20 minutes and I charge $50 minimum for getting a buffer out and touching your car with it, one was a $50 headlight restoration for a neighbor (I normally don't do HR ala carte. I offer it, but I usually sell it with some kind of wash service).