YOU SAID:

I need to go home and have a long hot soak in the bath.

INTO JAPANESE

家に帰って、お風呂に長く浸かる必要があります。

BACK INTO ENGLISH

You need to go home and soak in the bath for a long time.

INTO JAPANESE

家に帰って長い間お風呂に浸かる必要があります。

BACK INTO ENGLISH

You need to go home and soak in the bath for a long time.