I can add my personal longest-day story. Short background: I started bike touring back in high school, and had done several multi-week bike tours[1] before doin

I can add my personal longest-day story. Short background: I started bike touring back in high school, and had done several multi-week bike tours[1] before doing my longest day many moons ago. It was a flat 400k randonnée. Two starters, we stayed together for the first 100k and then he took of[2]. I was pretty fine for the first 300k[3]. I had had a hamburger at 150k and a pizza and 250k, in addition to some bananas and snacks, so I was in good shape enerywise. But then it got dark, and started to rain, and I was getting tired. Tired to the point where I actually fell asleep while biking. Probably just for a second or two, but I had drifted into the opposing lane. It was after 11pm on a lightly trafficked road, but still. And I could just as easily gone into the ditch. I became wide awake at that point, and then pretty much limped home for the last few hours, getting home at just before 3am after having started 5am the previous morning. I did do a few more 250-300k rides the following couple of years, but I realized I also had found my limit when it came to long-distance one-day rides[4]. This summer I did a very nice 650k, 9 day tour on my Brompton. That's more my style these days. [1] Generally averaging 90k per day (with rare days up to 150k) at a leisurely pace. [2] In the end, he finished like 5-6 hours before me, IIRC. [3] I had done both a 200 and 300 during the previous six weeks so was in pretty good shape. [4] It's probably been 15 years since I did more than 200k in a day.