Typical book time for rear main oil seal replacement on 2001 Ford Explorer Sport Trac

I got an oil/filter change recently, and the tech said it looked like some oil might be leaking from the rear main oil seal. He suggested going to the dealership to have them look at it. But I'm planning to call around to different shops about the work. What's the typical book time for replacing a rear main oil seal?

Asked by for the 2001 Ford Explorer Sport Trac
2WD or 4WD and two engine option and manual or auto transmission, for the sport trac. these factor make a difference in the price from 3.8 hours to 6.7 hours.

That combination the book time is over six and a half hours to replace.
Thanks, Patrick. I've got an automatic transmission, and I can switch from 2WD to 4WD. Where would the book time fall in your range?