Well I pulled a book off the shelf to re-read (Jemima J), and got to 15 minutes. I was fine, so I decided I would go 40 minutes. I got to 35 minutes and noted on my HRM that I had burned a whopping 145 calories. I decided not to pay attention to that and to just keep moving and reading.
At 55 minutes, I got really bored. But I got through it.
Did I burn calories? A few. But the bike is the biggest misconception in exercise I believe. I can ride and ride and get nothing. Granted I wasn't going at a high speed (I'm not spinning or anything), but I always thought I was getting a great workout until I got my HRM.
So here are the stats:
Mileage 13.3 (4:41 min/mile)...I'll admit, slower than usual
Max HR 121
Avg HR 108
In zone (111-166): 19:28 min