I was looking for something else and found this letter from Roland King-Farlow in the VSCC Bulletin for Winter 1971/2:
I have since discovered a bit more about the double Bol d'Or gentleman of whom I wrote previously. My source has been some articles written in Speed in 1935/37 by an alleged authority on motor racing history, but one who suffers from a bad memory.
In 1931 M. Chéret set off on Whit Saturday in the 24 hours for motor-bikes, and duly scored a win in his class. One hour later, possibly after a brief nap, he ventured out on a 350 c.c. Sphinx-Staub three-wheeler for another 24 hours of fun and games, single-handed as before. And again he won his class, though it must be admitted that nobody else entered.
The following year he had trouble. Having again scored his class-win in the motor-cycle 24 hours, he started off on the Sphinx-Staub but, somewhat ill advisedly albeit understandably, dropped off to sleep. Recovering consciousness in the ambulance tent, he asked passionately after the condition of his tri-car, and on being told it was apparently undamaged, he leapt up, scattered the first aid staff and marched back to the wreck. Having pushed it back on to the road he got in again and duly completed his second 24 hours.
And now I see that the F.I.A. or Jackie Stewart or somebody want to ban anybody from driving for more than 23½ minutes, or whatever it is.