Staunton is about a 2 hour drive from the Richmond airport, and about 2.5 hrs from Washington Dulles.
Please be aware that traffic in northern Virginia (if you fly in or out of Dulles) can be quite heavy, and especially during rush hour can add greatly to travel time, but traffic around Richmond generally moves quite easily with few delays.
The distance from Dulles to the pre-meeting motel in Hopewell, VA is about 2.5 hrs, and from Richmond, less than 30 minutes.