Well i settled for the 50 mile route today...which ended up at 51.67 miles. Did it in 3 hours and 8 minutes (about a 16.5 mph average), so not bad considering it was all hills and the last 15 miles or so were dead into a 10-15 mph wind.

Pushed it hard...averaged 81% of my max HR (for three hours!)...HR monitor says I burned 3382 calories...feels like it too. Made me useless for the afternoon...but I am feeling reasonably good now. Going back out tomorrow morning to do an easy flat ride in the 30-40 mile range for recovery.