The Lost finales were always two hour time slots, but occasionally the episode before the finale was technically part 1 of the finale, those being Exodus and There's No Place Like Home (which both are split into three parts). Making them a little over two hours without commercial

The rest were just the normal two hour finale that would be a little under 90 minutes without commercials (these ones are sometimes edited as one episode or sometimes split into two parts, there is no consistency on streaming services).