I also did the Dawn to Dusk a few years ago on a similar attempt. Actually we were trying to visit as many WW2 US 8th Air Force bases as possible in a a day, and we had to do it in a helicopter as most of them don't have runways any more. Lots of them are very close together, like 5 mins flying time, and at each one we landed, left the rotors running, took a couple of pics and left for the next one. Between 0800 when the mist cleared and 1900 when we collapsed into the hotel bar I think we managed about 37. A very strenuous day's flying but great fun. Then 6 weeks to write it all up for the competition..