Show them this: http://landing.newsinc.com/shared/video.html?freewheel=69016&sitesection=ndnsubss&VID=23317757 It's 135 mile race (3 day limit) in Northern Minnesota. Temps as low as -30 F. They have to haul survival gear, sleeping bags, etc with them. You have to register to read the article but it's not required to watch the video.

My 6 mile commute is like a garden stroll by comparison.

Of course there's no cars to deal with, - just wolves.

There are 2 checkpoints. Not sure how far apart they are but there's nothing much in between except a few shelters. Just making sure you have enough water would require some planning. You either have to bring it with you (and keep it thawed) or be able to start a fire and melt snow.