Close, but not quite (at least in my store).
The graveyard pharmacists typically work a 10PM-8AM shift. They work 1 extra hour on TWO shifts in a given week; making the total hours worked 72. Anything PAST 8 hours in a single shift is overtime.
To help you gauge the flow, my Walgreens fills ~400-500/day. We usually slow down close to 10PM and start clearing out the work que fast. I usually finish all of the morning's due prescriptions by 11PM, so after that, the night pharmacist is free.
Unless there are drugs to be put away (which is also usually taken care of before the graveyard shift), the pharmacist will sit around and fill maybe 5 ER scripts in a busy night. We have a very efficient staff; it is really amazing how well our techs are trained. 🙂