The modern Olympic Games last 16 days from opening to closing ceremonies. This includes both the Summer and Winter Games. During this time, athletes take part in over 300 events spanning 35 officially recognized Olympic sports.
When the modern Olympic Games were revived in 1896, the games lasted a total of only 10 days. As the decades wore on and more many events were added, the duration of the games were extended to accommodate them.
For a few days before the opening ceremonies, each team receives individual welcoming ceremonies to the Games sponsored by the host country. Though a long-standing tradition, the welcoming ceremonies are not considered part of the official running time of the Olympic Games.