I'm sure there are some good ones out there, I'll start.
I worked with a Nissan master tech that absolutely blew my mind at the shortcuts he had found, he actually got calls from Nissan Tech Line so they could try to get his secrets. He was also taken to court over one, the customer claimed there was no way he performed the service in the amount of time he had the car.
Pathfinder/Frontier V6 timing belt: 45 minutes, book 6.7 hours
(VG engine) Quest fuel injectors: 15 minutes, book 4.6 hours (this was the one the dealer was sued over, Cx was a waiter)
Z32 TT clutch: 40 minutes, book 5.2 hours
When I worked for Honda, there was another wise guy, he wasn't as pleasant of a coworker, but he was also quick.
Odyssey transmission: ~90 minutes, book 8.2 hours
6g Accord V6 transmission: ~90 minutes, book 8.2 hours
The only secret I learned was on the Quest, it involved a die grinder, and there's still no way I could do 15 minutes. These guys were just experienced.
[in response to VW generator belt change in on-topic forum]
