you should be able to go 2 hours at pretty hard intensity without needing anything other than your normal breakfast. no need to carb up, however, if it was a really intense 2 hours you want to make sure you have something for recovery purposes right after the ride. IF your inclined to have something on the sugary side, this is when it should be, immediately post ride as your body will actually put it to use and not store it. After a hard ride 2+ hours I go with simple protein powder mixed with whole milk and I actually add some additional sugar to it to up the carb amount since the protein powder I use has next to no carbs in it.