“You’re really planning to return?” buy Mune said. “In five years,” said Tuf, “the first payment on the loan will be due. By that time, moreover, we will be able to judge what effect, if any, my small contributions have had upon your food crisis. Perhaps more ecological engineering will be necessary.”
And they've both forgotten that the bet was to extend the repairs on credit if he could fix the problems... it was never said that his fix work was without charge, so he can present the bill in five years and payoff the loan entire!

