YOU SAID:
How long should i let it air for?
INTO JAPANESE
どのくらいの期間でそれの空気を聞かせてください?
BACK INTO ENGLISH
Let it air in how long?
INTO JAPANESE
どのくらいの空気を入れるか。
BACK INTO ENGLISH
How much air?
INTO JAPANESE
どのくらいですか?
BACK INTO ENGLISH
How much ?
INTO JAPANESE
どのくらいですか?
BACK INTO ENGLISH
How much ?
You've done this before, haven't you.