The Netflix One Piece live-action series has one of the most monumental tasks of any adaptation. It needs to take a narrative built up over 26 years and compress its content into eight-episode seasons. Even at a rate of one hour per episode, that should take a while. Most arcs have taken several years and dozens of chapters or episodes to cover. Even the East Blue Saga, the first leg of the Straw Hat Pirates' voyage, took over 60 episodes to tell in anime form. The only way for the Netflix version to get through all this while the actors are still young enough for the roles is to make enormous cuts to the content.
Source：https://www.cbr.com/one-piece-live-action-shorter-than-anime/
