YOU SAID:

I need to wait seven minutes until class ends

INTO JAPANESE

授業が終わるまで7分間待つ必要があります

BACK INTO ENGLISH

You need to wait 7 minutes for the class to end

INTO JAPANESE

クラスが終了するまで7分間待つ必要があります

BACK INTO ENGLISH

You have to wait 7 minutes for the class to end

INTO JAPANESE

クラスが終了するまで7分間待つ必要があります

BACK INTO ENGLISH

You have to wait 7 minutes for the class to end