Since the Olympics only officially run for 16 days, with only slight expansions allowed to accommodate sports such as football, this effectively makes it impossible to conduct a 15s tournament within the current Olympic schedule. This limitation does not apply to sevens, as games last only 14 minutes (20 in championship finals) instead of the 80 minutes in the 15s game. All of the events in the current men's and women's Sevens Series, which feature a minimum of 16 national teams for men and 12 for women, are conducted within a single weekend.