Pick up job ticket from service writer.
Clock in on job.
Go find your car in parking lot.
Bring car into shop.
Setup equipment and calibrate speedo.
Clean up and put equipment away.
Move car back to parking area.
Return job ticket to service writer.
Clock off job.
Yea, I can see all that adding up to about an hour.
And of course you forgot the chance that something went sideways,the spedo was off,and they had to do it again,but this time they tested it,and it was STILL off,so they tried putting it back to stock,and it was still WAY off,so they spent an hour on the phone to Ford finding out that there had been a change that meant they had to do something different,but still could only change the customer the 40 dollars they promised. Now they are behind 4 hours. Now someone is going to say that if they screw up or cant do what was promised they SHOULD eat it,but they are there to run a business and make a profit. Screw ups happen and if they dont charge enough to make a profit at the end of the month,including the screw ups,they wont be in business next month.
Ive worked in a repair shop. (Computer repairs) Your going to get two kind of shops. One kind charges a honest rate that they can make a profit on. The rates and minimum times are setup so they can promise you a particular price for a job and under most circumstances stick to that. Sometimes,you find it was much worse than you thought and there is no way around it though. For instance,if you take your car in for a new clutch,and they find the clutch failed because the transmission housing is cracked and the clutch is soaked in gear oil,they are not going to replace the transmission for free just because they quoted you 900 dollars to replace the clutch. They MIGHT eat the 5 dollars in parts and rebuild a bad slave cylinder,but then again,they might not want to and say they need to charge you 50 bucks to rebuild it.
The other kind of shop gives you low ball estimates and then jacks up the price for all sorts of made up stuff. They knew damn well there was going to be more,and quite often it was exactly what the initial estimate said and they are just trying to make up for their screw up. For instance,their tech cross threaded a bolt,and now has to spend an hour and a half fixing it. They really cant charge you for that,especially since they are doing flat rate repairs,so instead,they tell you the brake calipers were actually too worn to resurface and the brakes had worn into the calipers. They spray off the old caliper with some break cleaner and maybe hit it with a can of paint and you think you got new ones. Their prices sound good when quoted,but there is usually something more,because the reason reputable shops have much higher prices is because no one can actually turn a profit at the cheap shops prices.
It reminds me of the time when I brought an RX7 into Peb Boys. They had a deal where they would do an emissions inspection on your car and do any minor adjustments needed for 50 dollars. (tells you how long ago that was). I took it in,and one of the techs saw it and was all "Cool,an RX7,I used to race those". He popped the hood,pulled out a screw driver,adjusted two screws and the car sounded better than it ever had before or since.
Unfortunately,he was not the state certified emissions tech. They took the car in,worked on it for three hours,and then told me it did not pass and that I would have to bring it back for an engine diagnostic for 100 bucks plus whatever needed to be repaired or replaced. I looked at the paper sitting on the counter from the machine and it said "PASS". WTF! I pointed that out and he looked very uncomfortable,went back,talked to the tech,and came back and said he was mistaken and that it had passed and that it would be another few minutes for the tech to readjust it. Apparently,they spent so long adjusting it,they un-adjusted it,then tried to get me for an engine diag and probably some repairs,then they would have readjusted it and given it back and pronounced it fixed. It took another half hour for him to get it to pass again.
When it was finally read,they told me "Next time you need it serviced,you should probably take it to a rotary engine specialist",in other words "Get it out of here and dont bring the damn thing back because we dont know how to work on it!" Just to add insult to injury it ran horribly.
Honestly,they should just have told me they didn't know how to work on it and be done with it,and I would have went elsewhere. I had an old 68 Volvo with dual SU carburetors that I never could get to pass emissions. The worst part was, many places refused to touch it because they didn't have any experience getting the two carbs in balance. The ones that would quoted me very high prices not because they knew it was going to take a lot of effort but because they knew it was risky. Who knows what your getting into or for that matter,what you might break.