Went riding here yesterday:
http://www.routeslip.com/routes/14197
It's about 30 miles each way or just a bit under 2 hours each way.
After a short stop at Tydings Park, I stopped in at a Burger King to thaw out with a hot cup of coffee and sandwich. The temps were in the low 20s and the windchill in the teens, so I needed this.
After thawing out and drying up the best that I could for the 45 minutes that I stayed at the restaurant--because there's nothing as bad as having to go back out in these temps and winds with a wet kit--I headed back home.
The ride home was uneventful once I got over the initial chill I received (my clothing wasn't quite as dry as I'd hoped for.)