Can you die from walking?!!! :P

So I'm doing Gaisce and as part of the award you have to do a hike..which is on friday. We are leaving school at 2 o clock on friday and will return at 6 on saturday. I've been working on gaisce for like the whole year, and when I do the hike I will get my award :D So what I didn't know is that the hike is 25km, yes I said 25!!!! :O seriously, I don't know if that is physically possible, but I will soon find out. I am going to bring the a LOT of food, to keep the energy levels up :P If I ever recover from the hike, and am able to type when I return, I'll let you know how I got on..........