There is only one way to find out

If it's like 1.5h driving vs. 2.0h on a bike I'd try riding. I don't consider the time on a bike time lost, versus the time in a car that is time lost for me. Although, this would be physically tiring and for someone who didn't ride in a long time, it's plain impossible. Also, in bad weather it would be both physically and psychologically demanding. An immense body and mind (will) workout to say the least. But if you could pull this off you'd be one fit son of a gun

My commute is about 8 miles and want more, but 31 miles, wow, that's a lot. Keep us posted, would ya?

Adam