The event involved pupils giving up a day of their February half-term to raise sponsorship money by taking part in the same activity between 9am and 9pm.
Activities for 2001 included: computing, five-a-side football, table tennis, model making, badminton, Scalextric, music, and board games.
One youngster even spent 12 hours riding around the school car park; another, meanwhile, roamed the corridors in a gorilla outfit.
Proceeds from the event went to the school’s Charity Club.
9. Boston Grammar School 12-hour Marathon 2001
In costume, James Hill (left) and Jonathan Lenton. Photo: Boston Standard
10. Boston Grammar School 12-hour Marathon 2001
Charity Club members Paul Singleton, Adam Skinner and Adam Gamwell manning the check-in. Photo: Boston Standard
3 / 3