The 12 Hour runs can be approached in several different ways. Many will test themselves to see exactly how far they can run in this set amount of time. Others will use it to run a goal distance in a fully-supported race setting without the worry of deadlines or cut-offs. Others will simply run to see if they can keep moving for that long!
Few are expected to run without any stopping the whole time. Walk breaks are advised. Runners will also pass through the start/finish area with each loop and will have the chance to stock up on fuel, change shoes or clothing, visit friends, etc. Support crew may set up personal "support stations" near the start/finish area. Expect a party-like atmosphere as you come around each loop with support personnel ready to get you whatever you need. There will be an abundance of hot and cold food of many different varieties to keep everyone full and happy.