As an examiner myself, I can tell you that a lot of instructors and Examiners are using the Sim inefficiently.
Instead of reproducing realistic scenarios, you get engine failure on take-off, recover, engine quick restart, hydraulic failure, recover, unusual attitude, recover, transmission failure.. All within the first 15 minutes... (you get the idea).
I try to use the time as efficient as possible as well (by avoiding long empty legs), but I manage to cover the mandatory exercises and leave some time at the end for the pilot to practice things he wants or needs...
(But then, I am not flying any of those hypercomplex types like a 189 or stuff..).