Zwift did this event last year too because of Covid. This event features 17 different triathletes who will lead a group ride each hour for 17 hours of the day. There will then be a 9 hour run portion where triathletes will lead a group run. The reason why it is 17 hours of Kona is because 17 hours is the cut off for the race. This event takes place on the 8th of October until the 10th. Kona is the full distance IronMan World Championships, it is very well known among triathletes, and a huge achievement to participate in the event. For a complete schedule of the events, and who is riding when, head over to this article: https://www.zwift.com/events/series/17-hours-of-kona-2021.