Did they tell you they will keep the vehicle for two days?
The time seems a little high but maybe they know about the skill level of the "technician in training" better than we do.
Personally I would think that they can get things done in one day. I had a Blue Ox face plate and the diodes for the lights installed in about 4 1/2 hours and they had to basically take a lot of the front end apart on my Chevrolet HHR. I watched them for awhile and it was obvious that the technician knew what he was doing.
Every vehicle is different and I did not have a braking system installed. As far as installing the tow bar, 15 minutes is plenty of time to push it in to your hitch and install the pin. A little longer if you install the anti rattle type lock with it.
