On the touring parts of my tours, I try to keep my rides under 12 hours. But my tours usually surround long-distance cycling events like the Paris-Brest-Paris 1200K, the Great Southern 1200K, etc.

When it comes to long-distance events, I've done two 24-hour races (the UMCA 24-hour in early September in Iowa/Illinois) and four 1200K randonneuring events where you have to complete 1200K in 90 hours or less including all breaks ... and I'm a slow rider so there's not much sleep involved. See my website in my signature line for details.