When you`re really pushing it, what is it that normally demands that you call it a day? Knees, feet, butt, something else? Never really hit a physical limit?
On roads (paved or maintained dirt), my limit depends on what kind of mood my knees are in. On a good knee day the pain in my butt eventually decides for me when I`m at the end of my road. That`s maybe as much as eight hours of broken up saddle time or five to six in a row (you can stop laughing any time, rando folks) and my knees are still looking for more. If my knees are in a crappy mood, one or the other (rarely if ever both) is capable of stopping me within two hours or less and leaving me hobbling around like an arthritic dog.
On rough terrain, it`s a different story- I don`t remember ever being stopped by knees or butt. It`s always been an all around bonk/out of gas/"say goodnight, Gracie" situation. I imagine my butt does better because I spend more time out of the saddle, but I have no idea why my knees don`t ever bother me on those days. It seems like it should be much harder on them than road riding.
So, what stops you? I`m curious as to how many people get stopped by what parts of themselves and how consistant it is for you. Most always the same thing, depends, or it could be anything? Or how many have still been in good shape at the end of EVERY day and never hit some kind of limit?