Just curious,how long can you last on a bike trainer?

I just got a bike trainer, this morning I did my second workout with it. I do intervals on it, and its intense. Right now I can only handle an hour on it, even though I can ride on the road for 3 hours. After the hour I can barly stand and my legs are shaking and burning. If you use a bike trainer how long can you last on it?

sounds like you need to ease up on the tension :)

i can last a couple of hours, but after that the boredom gets to me....

2.5 hours was my longest...

It's going to depend on what you have it set at like Bill said.
I can ride 6+ hours on the road.  But if I am doing a high intensity spin class, I'm glad to get off the bike after an hour.

Scott