Aikamoinen pyrähdys!
My own longest biking in single sitting is about 250km in 16 hours to my friends cottage from Kerava to Taipalsaari, Lappeenranta, and I gotta say it was pretty hardcore. But I'm planning to go for a very long-distance trip around Finland in the start of autumn when I'm a free man from my civil service!
That's commendable! 16 hours is a long time in spite of not having sacrifice your sleep.