i dont remember exactly, i do remember being told that the "aisle "legnth they tell you will take it out the door. the company i used made the legnth the the 1st set of double doors.
someinfo on aisle runners..
i used http://www.originalrunners.com/ they were so nice and they copied the pattern on my program i loved it
I've seen some really lovely runners that were used by the FTW couples in Disneyland. Perhaps you could ask who the DL branch of the FTW organization recommends (in case it's different than who the WDW branch recommends).