There have been several occasions when an episode of Lost has been required to run longer than the usual 40 to 42 minutes and has been extended by around five minutes to avoid cutting important scenes. Also, the final two episodes of each season have been written to be aired as a single two-hour finale episode.

Episodes

The following episodes have been extended:

Season 1

• "Exodus, Part 2" – Season 1 finale

Season 2

• "The Other 48 Days"
• "What Kate Did"
• "The Long Con"
• "Maternity Leave"
• "Dave"
• "?"
• "Live Together, Die Alone" – Season 2 finale

Season 3

• "Through the Looking Glass" – Season 3 finale

Season 4

• "There's No Place Like Home, Parts 2 & 3" – Season 4 finale

Season 5

• "The Life and Death of Jeremy Bentham"
• "The Incident, Parts 1 & 2" – Season 5 finale

Season 6

• "LA X, Parts 1 & 2" – Season 6 premiere
• "Ab Aeterno"
• "The End" - Season 6 and series finale. The episode was extended by 30 minutes (22 minutes of footage) to 2 1/2 hours