I would think the commute time from Locust Hill to Frederick on Rt#340 would be 30 min on a very good day. The bridge over the Potomac is a bottleneck at rush hour and then there's the casino traffic to "contend" with. Not un-doable though.
Locust Hill is the golf community out there, isn't it? My Dh plays there on occasion ..it looks to be very nice.