None of this sounds right to me. I did an upper oil pan gasket for a customer that has a fleet of these 6.7s on a 2017. It was a pretty easy job even without a lift. Pulled the transmission and tcase together and just scooted them back a ways, lifted the engine a little and pan out- pan in. Took a little over half a day. I charged him $800 labor.
It was even under warranty and could have been completely free at Ford but he didn't want the truck tied up for too long so he opted to just pay me to do it.
At the time I had zero experience working on a Ford 6.7 other than having deleted my own and doing oil changes. I thought it was a really easy job as far as pulling the transmission and such.
I did a gas engine replacement for another customer on a 2014 that got sky high quotes from other places talking about cab removal and things like that. It took a little over 2 days with swapping everything over from old engine to new but was still a really easy job. No cab removal. I quoted them 40 hours. It ended up being 19.