Tunnel Vision is a 2001 novel by author Keith Lowe, his debut novel, published by MTV Books on 1 October 2001. Set in London, the plot revolves around Andy, a man soon to be married, who makes a drunken bet with his friend Rolf two nights before his wedding that he can visit every single station of the London Underground in a single day.
Andy's bet takes place a week before his wedding.
The context says the bet takes place "two nights before his wedding." There is no way 2 nights before can be equal to a week before the wedding date. I'm unsure how the system got this wrong; it's pretty surprising actually.