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A total of 107 Waitaki Boys' High School pupils hope to raise $10,000 from this week's 20-hour charity run.
The run started at 1pm on Sunday and finished at 9am on Monday.
Staff and other pupils gathered on Monday to support the boys on their final lap.
The proceeds will go to Project HHH to help send medical teams and resources to earthquake-damaged Haiti.
Robyn Couper, who worked as a missionary in Haiti for 33 years and who heads Project HHH, spoke to pupils at Waitaki Boys last week.
She was at the school to watch the end of the run and described it as "absolutely fantastic".