I did driving hours only with Calvert on Auburn Ave Bethesda. They used to pick me up at 7am on a Sunday and I'd be home again by 9am in time for the rest of the house to wake up.
I've just looked up their address on Yelp and seen there is one bad review regarding loss of paperwork for the driving test.
I cannot comment on that, but the driving instructor and the timing both suited me fine and were supplemental to the original driving lessons and classroom time that I did at Easy Method Driving school in kensington (I think they also do just driving hours if you ask them to).