How long should it take a dealer to:

Replace window regulators for rear windows – left and right.

Replace engine air filter, replace passenger compartment filter.
Check the supercharger oil level and add the supercharger oil as needed.
Change automatic transaxle fluid and filter.
Inspect engine accessory drive belt.

Inspect entire car – brakes, shocks, struts, anything…

Hmmm, I use to work for a shop...

You have to be VERY specific in the work/inspection they do.

When I take my vehicles in for a state inspection, I SPECIFY, NYS inspection ONLY. Or, if I'm having a different task being done, I SPECIFY that task only. Do NOT look for other things. Otherwise, they will spend more time looking for things for them to replace and charge you money. It'* a marketing scheme. Stay away from it.

Your probably looking at about 2-3 hours of ACTUAL labor time.

Why do you ask?

Because I am bringing my car in - and don't want to get taken advantage of

I agree with Mike on the timeline. You could cut some of that labor out though if you are at all handy.

I would ask how they plan to change the fluid in the transmission. We generally recommend a pan drop and filter change. You get quite a bit of fluid that way and don't disrupt anything in the transmission. This is actually an easy job, the hardest part is getting that dang filter out and learning to just leave the filter ring alone if it'* really stuck in there.

Supercharger oil is a snap to check as well and should be changed fairly regularly. You can use Mobil 1 Full Synthetic 5w30 in the SC, I would recommend sucking the fluid out through the fill hole using a small hand pump or turkey baster contraption, then refilling.

Air filter, easy stuff.

Rear Window regulators can be tricky. Need to make sure to properly reseal the water covers inside the doors otherwise you will get water on the floor in the back.