That does sound like a rather early cutoff, so expect the pace to be pretty quick. But otherwise, it sounds like you will be just fine. The best piece of advice I can offer is just to listen to your body and give it what it needs. You are the powerplant that's going to get you to the finish, so make sure you take in the right amounts and types of fuel and lubrication.
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"Obstacles don't like me very much. I make them look bad."