Do you mean attempting to travel to every single station on a given line as quickly as possible? If so, there would be no point in doing it if it were the Waterloo & City. But I'm sure someone would do it anyway.
district line would be fun you could do it so that you have to visit every station on that line but not necesarily using that line (i.e.you could take the district from Upminster to Gloucester Road, switch to the circle and take the circle round to edgware Road as you would have to Earl's Court later on in order to do Olympia, if that makes sense.