Enduros are for the most part one large curcuit and you usually dont ride the same section of trail twice. The exception is transfer sections from one trail to another. Most of em have multiple "escape routes" in case if bike issues. If it hasnt been addressed already, bring a spare full gas can to pit either at parking or to be put on a trailer and taken to a designated area by officials.
First rider out at 8:01am and let's put it this way. You will be past ready for lunch when you get back Lots of saddle time but if you can stay on time you can catch a little break here and there.