YOU SAID:

40 minutes until this class ends

INTO JAPANESE

このクラスが終了するまで40分

BACK INTO ENGLISH

40 minutes until the end of this class

INTO JAPANESE

このクラスの終わりまで40分

BACK INTO ENGLISH

Forty minutes to the end of this class.

INTO JAPANESE

この授業が終わるまで４ ０分。

BACK INTO ENGLISH

Forty minutes till the end of this class.

INTO JAPANESE

この授業が終わるまで４ ０分。

BACK INTO ENGLISH

Forty minutes till the end of this class.