They're 4-8 month internships depending on which program or study track you choose to pursue. A lot of Waterloo programs alternate between 4 months study/4 months internship.
My program's first coop starts after freshman year (after 2 semesters), 4th coop was after first half of 3rd year, and 6th coop was 4 months before graduation.
My program's first coop starts after freshman year (after 2 semesters), 4th coop was after first half of 3rd year, and 6th coop was 4 months before graduation.