I used to fly 12 hours in a day with 2 pilots on a Part 135/91 gig. Not 1 leg, but multiple legs. You can surely do it and not even notice it.... on a nice clear day with most of those legs empty (as in nobody bothers you) and never dealing with an aircraft swap or airport terminal and the pilots 29 and 27 years old. I'm with dawgs the more I think about it, multiple leg days flying late is a receipe for disaster... especially on the regional side where pilots are understaffed, underpaid and without any meaningful workrules.

BTW, how many fewer pilots would an airline need if it could exceed 8 hours in a day? And how much would it cost to now negotiate and retain what was once law?