What is the maximum length of telephone wiring that you can have between any network adapters in a HomePNA network?

This is the length of the telephone wire from the first network adapter to the first wall jack, plus the length from the first wall jack to the second wall jack, plus the length from the second wall jack to the second network adapter. In some instances, the length of the cable running between two wall jacks may be longer than the physical distance between the two jacks, especially if excess cable has been stored in loops behind the wall.