YOU SAID:
Captain I need to know how long you will have to take the pee
INTO JAPANESE
キャプテン私はあなたがおしっこを取る必要がある時間を知る必要があります
BACK INTO ENGLISH
Captain I need to know when you need to pee
INTO JAPANESE
キャプテン私はあなたがいつおしっこをする必要があるかを知る必要があります
BACK INTO ENGLISH
Captain I need to know when you need to pee
You've done this before, haven't you.