Experimentally, we tried driving out there today at rush hour. Exited from 128 onto 20 at 5:25. Arrived at the light near the possible house at 5:47. (10.8 miles)
Took a different route back, saving .7 mile, but having to pick our way across a couple of tough intersections - a route I would take only if there were obstructions on others.

I'm more worried about mornings than evenings, since I have a fixed time I'm supposed to arrive at work.