Need Camcorder Recommendation

Personally, I know nothing about them.

Work wants one.

We are a training facility and they want to film the instructors as they teach. They then want to use these videos to critique the instructor and help them improve on their weaknesses.

The camera would be placed at the back of the room, approximately 30' from the instructor.

It should be:

simple to operate (remote control?)

hold at least four hours of video (the more the better)

able to play through a computer (USB?) to show on a projector

able to pick up the instructors voice and any questions the students ask

TIA