The flight of "Question Mark" sparked controversy in the aviation press, factions of which treated it as a failed stunt. Nonetheless, over forty refuelled endurance flights were attempted that same year, many attracted by visions of sponsorship and financial rewards. By the end of 1929, the record stood at 420 hours, and in June 1935 it was reset at 653 hours.
653 hours = 27 days 5 hours
http://users.chariot.net.au/~theburfs/URtrailRF.html
