My longest ride on a stationary bike is 5 hours. I did back in 2001 and none of the riders from my club have attempted to break that record. I’m a bit proud of it, but take a look at this article. It is about a man who attempts to ride more than 82hours on a stationary bike (5 minutes break per hour)…!
What is your longest indoor ride?
Aged 76 I have just completed 25,000 miles on my exercise cycle in a series of daily rides. That equates to around the world. In 1952 I did break the local Worcester 12 hour record ride with 228 miles, 900 yards, still recovering. Good luck to all the fit youngsters.