No advice, the longest I've been on the bike since my whiplash injury in October was 90 minutes and that was on the road. I do, however, want to wish you good luck and have fun while training!
I found that, for me, when riding longer than two hours was to have liquid nutrition in the form of Accelerade and something like a broken up Cliff bar or two and some shot blocs ready for me to consume. That was for very long road rides though, mountain biking uses more energy...



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. I did them on my bike with 1,9" tires. There was a strong head wind in the last 50 miles but we had to get back anyway. The last 5 miles I had issues with my gears and I was really upset because I had a XC race on Sunday and I didn't know what the problem was. Happily, my husband found out a crooked part in my chain and removed it. So I was ready for the Sunday's race. 
Little does he know, he just sealed the deal for me. I don't respond to nay-sayers. I'll be finishing this race now no matter what the cost

