I’ve worked with people that charge anywhere from $85 to $250 per hour, but it definitely depends on your experience and portfolio, as well as the level of client you are shooting and the end uses for the shot.
If it is going into a brochure that will be printed 10,000 times or more, then it will probably be a different price point than if it was just a single portrait that will be blown up to 16×20 and hung in a living room.
Another factor may be that you are expected to do an hour of shooting, plus the time it will take to setup and breakdown the lighting equipment. So you have ot factor in your time for that as well.
If you are just trying to build your portfolio, I would probably set a much lower price than if you have an extensive portfolio.