depemds on the set up, you either pay for it yourself, so you decide before eg i wan2 go to spain, and see how far you get in 36hours then pay for the rest of the way, when you get to spain you have a holiday and then come back. or you take the money for getting back out of the money you raised, so take a train and stay in hostles and stuff till you get back home, if that makes sence so like every £100 you raise £25 goes on getting back or something like that.