It's more than I would drink in 2 hours.

One thing I found last summer -- when I started to get more sodium during rides, I started peeing more during rides. Before that, I tended to retain water and go very little during the ride, and then once I was done I would have to go every 20 minutes for the next several several hours. They say you should address dehydration by weighing yourself before and after a ride and then drinking 16 oz of water for each pound you lose, but I always weigh more after a ride than before. But like I said, getting more sodium (and other electrolytes, in my case with Gu Roctane) helped with that.