How Long Does Usopp Leave The Crew. Usopp wants to save and repair the Merry but Luffy sees sense and knows its safer to leave the Merry behind. Sometimes it can probably be as you define it 5days but perhaps less sometimes it can probably be weeks.
Luffy pretty much told Usopp The Merry is going to die and you are powerless to stop it. After the events of Water 7 he is 8th. Episode 20 is where.
The One Piece time jump covers a period of two years during which the Straw Hat members are all training in isolation to better develop their abilitiesThis period lasts from the end of the Summit War story arc to the Straw Hat crews reunion on Sabaody Archipelago and is largely not depicted in the One Piece manga and anime.
In terms of power level Oda has gone on record to say that he will always be the weakest member of the crew so in East Blue he is 5th. The last part is something Luffy shouldve never said as it drove Usopp to leave the crew and challenge Luffy to a fight. Additionally Chopper and Sanji have been coerced by third parties to leave the crew despite their wishes with Chopper returning soon afterwards. After the events of Water 7 he is 8th.