Hopefully you're halfway through the ride, and will report back soon.
According to STRAVA, I'm burning somewhere between 3000 and 5000 calories on a long ride.
I don't have any set feeding, calories per hour, etc. But, a good meal can be rejuvenating. I do like to stop every 40 or 50 miles for a short snack, refill water, etc.
I do find myself eating anything in sight. I don't pace by calories per hour, but could easily eat a good 1000 calorie+ meal. More?
I do like things like cookies... carbs, sugars, some fiber, etc.