About 5-5 1/2hrs from Hartford. I used to live in CT.
You're quickest route is 84W to 17W follow 17 to exit 30 turn right off the exit. When you come to a large steel bridge on your right (can't remember the street name but you can't miss the bridge) turn right, head straight for about a mile or two and van allen rd is on your left. Follow van allen rd for about a mile, maybe a little more and GRC is on the left side- can't miss it.