I rode 80 miles two days in a row to make it to Toronto and back. It was ****ing great. 51x18 and it was comfortable as all hell. I got back and then went on a group ride for 40 miles round trip, totaling 200 miles in three consecutive days.
I wish time would allow me to ride that much every day on one gear. I felt so fresh and alive. I ride about 20 miles a day on average, so stints like that should be a greater fitness task.