The one long ride here in NZ (4 160km laps of Lake Taupo- super enduro) requires you to have a support vehicle for 3 laps following you (the last lap is when all the rest of the 160km race happens during the day so you are asked to NOT have a support vehicle then).

The people I have known who have done the 2 lap Enduro (starts at 1am) have all grouped up and had one car following them during the first lap in the night (you need the headlights as well as bike lights as you are cycling through countryside).

Most of these guys stop for 1/2- 1 hour breaks after each lap to eat a proper meal, change cycling shorts and catch a nap.

Wow - my hats off to you and all other Super Enduro riders- you guys are amazing!