 The total number of hours shown in a given week during the performance phase of the competition has varied from two to four hours.A season's finale episode is often the most elaborately produced show of a season and features the last performances of the competitors, encore performances of many of the season's most acclaimed routines, guest dancers (including returning past season competitors and cast-members from other international versions of the franchise), musical performances, and multiple video packets chronicling the course of the season's events, all culminating in the announcement of the winner of the competition.Most seasons have featured a single winner, while seasons 9 and 10 featured both a male and female winner.