YOU SAID:
How long will you be here for?
INTO JAPANESE
いつまでここにいるの?
BACK INTO ENGLISH
How long are you here?
INTO JAPANESE
どの位ここにいますか?
BACK INTO ENGLISH
how long have you been here
INTO JAPANESE
ここには、どのくらいの期間いますか
BACK INTO ENGLISH
how long have you been here
Okay, I get it, you like Translation Party.