It really depends on the shop and how much they do.
If they just scan it and drive it? They might charge less than an hour.
Pull the wheels off to fully inspect the brakes, wheel bearings, and suspension? Expect a little more
If they go all out, hook it up to a set of A/C gauges, check it on the alignment rack, drop the transmission pan for inspection, read the plugs, check compression...etc... then you are getting into the $100s of $$$ range.
In most cases, the service writer is going to go for at least one hour.