I managed to get out and back on this run with less than 15 seconds total delay at crossings. Pretty remarkable. So, my time is what it is.
I didn't really have it today, and just wanted to cruise. It started getting dark at the turnaround, which was just as well. But, at the Harvard boathouse there was a dude that passed me, and after watching him for a bit, had to get him back. I did vanquish him but the next guy that challenged me at around Mass Ave I could not defeat.
The return trip was 41. Out was 45.
http://www.gmap-pedometer.com/?r=3999742