Back atcha. 1,2 or 3 hours, the last half hour sucks.
Actually, today’s workout was a slow “100k,”which would have taken about 2.5 hrs and I was doing fine at about 1:45 when 1. Apple Music radio stopped working and I had to pee and 3. I noticed I was putting out about 250W with no effort, which I quickly figured out was due to my tire going flat. So, I called it a day at 1:50 which, with my 15 min warmup, allowed be to claim 2 h.