As a long training ride, I was looking at doing 12 hours of Millstone up in Vermont as part of a team or some similar event to get me out for 6+ hours on the MTB. However, to save moneys and travel times I figured I'd just initiate my own endurance ride at our local xc spot.
I pulled together a 12 mile loop at Rockland Preserve in Madison CT that included nearly 1,000' of climbing and a good mix of flowy single track, technical rock gardens, and fast double track. I anticipated each loop would take up to 90 minutes.
I ended up riding 48+ miles (4 laps) in 6 hours and 45 minutes. I rode the first two laps with my local buddies, Todd and Dave. I felt very fast on my third lap (solo), however fatigue set in by my 4th and as I entered the last few miles of technical trail I was getting pretty beat. Amazingly I still managed to clean all the obstacles.
Overall, I felt good throughout this exercise. I think my nutrition was lacking towards the end and my general fatigue and low blood sugar affected my riding a bit. This is the longest MTB ride I've done in 4+ years.