YOU SAID:

I'll call you in twenty minutes.

INTO JAPANESE

20 分後に電話するよ。

BACK INTO ENGLISH

I'll call in 20 minutes.

INTO JAPANESE

20 分で呼んでいます。

BACK INTO ENGLISH

In a 20-minute call.

INTO JAPANESE

20 分の呼び出し。

BACK INTO ENGLISH

20-minute call.

INTO JAPANESE

20 分の電話。

BACK INTO ENGLISH

20 minute phone call.

INTO JAPANESE

20 分の電話。

BACK INTO ENGLISH

20 minute phone call.