The William Lowell Putnam Mathematical Competition is the preeminent mathematics competition for undergraduate college students in the United States and Canada. The competition consists of two 3-hour sessions, one in the morning and one in the afternoon. During each session, participants work individually on 6 challenging mathematical problems.
For more information, look at the following link: https://www.maa.org/math-competitions/putnam-competition.
TRU participates in the competition every year around December.