Hey ex 2500,
A good topic. In my hey day I used to ride 2-3 hours a day as an average session. When in Hawaii I used to ride up to 6 hours a day when not working with a break in the middle for lunch!
Nowadays, I find I get as much if not more out of a really full on hour where I ride as hard as I can trying everything, going as hard as possible, as opposed to a 4 hour session where I ride at a more sustainable pace.
Don't ride as often as I used to with work, family and other interests, but I still love it!
Good winds,