During the premiere series, the show aired six nights a week, being every night excluding Saturday. The eviction episodes and final aired on Fridays; after series presenter McCall announced the evictee, they had two hours to pack their belongings and exit the house during a second episode airing that night. The remaining five weekly shows were highlight episodes, which lasted an hour in length; the Sunday episode featured a group of psychologists discussing the events of the house. The second series aired six nights a week during the premiere week, though was reduced to only five days afterwards; the series did not air on Saturday or Sunday. This series featured two eviction episodes as well, though only featured a ninety-minute gap between the two. "Big Brother 3" was the first series to air every night each week, and every series thereafter featured only thirty minutes between eviction episodes. The third series was the first in the main series to feature a live launch, with all subsequent series featuring a live launch. The series continued to air for seven nights a week until "Big Brother 8", which aired every night excluding Saturday. The ninth series re-introduced the seven episodes per week format, which has been continued throughout all future series'. When the series premiered, it was aired in a 4:3 aspect ratio instead of the more common 16:9 widescreen format seen by other series at the time. Beginning in 2006 with the seventh series, the show was broadcast in the 16:9 format. Following the show's move to Channel 5, it was broadcast in HD. The series can be viewed on Demand 5, a branch of Channel 5, after it airs.