I keep thinking I should try that. Maybe I'll do it this afternoon on the way back.
My cruising speed is 20mph, so 10mph would double my time. But I do make the effort to ride slowly twice on my commute, taking the time to ride through 2 parks (1/4 mile long each) to slow down, enjoy the sunrise, the changing of the leaves, the rabbits, the fog rising off of the river and the beauty of a bicycle commute. Life is a waste if it is all rush rush, and a little time to slow down and smell the roses makes the commute beautiful.
(Yesterday smelled wonderful with a damp path from an earlier rain shower enhancing the crisp fresh smells of a fall morning).