I recently went (counts in head) one day without riding, but that was only because I had no access to a bike. I have to say, though, it definitely seemed like more than one day. I went out of town with some friends for a few days, but I rode in the morning before we left and after we got back. I was practically suffering from withdrawal. Haha, man, I'm a junkie.
Before that, I can't remember the last day I didn't ride. It was probably at least a few months ago. I don't know.
On the other hand, I don't ride 40 miles every day either. I think last month I averaged 29 miles a day.
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Bring the pain.