For what it's worth, this service took the mechanic 6 or 7 hours.
Unfortunately, it's tight enough down in the engine room that it was tough to see what he was doing half the time. And after 3 or 4 hours and not having eaten I ran out of steam trying to follow along. Finally, I didn't have the hardware or software to connect to the engine to check error codes, etc. and let Volvo know the engine was serviced for the official record.
I'm 6'3", 205 and I would have been miserable down there for 6 hours - especially the next day!
If we end up retiring for the cruising life, I'll have to get a full displacement trawler with a gargantuan engine room!