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.
1. Boston Grammar School 12-hour Marathon 2001
Table tennis fundraisers. Photo: Boston Standard
2. Boston Grammar School 12-hour Marathon 2001
Helping to organise the badminton marathon were Jackie Hallett and 10-year-old Laura Hallett. Photo: Boston Standard
3. Boston Grammar School 12-hour Marathon 2001
Raising funds through model kits. Photo: Boston Standard
4. Boston Grammar School 12-hour Marathon 2001
Music was one of the other activities occupying pupils for 12 hours on the day. Photo: Boston Standard