YOU SAID:

Time flies by when you're having the most fun.

INTO JAPANESE

ほとんどの楽しみを抱えている時間が経ちます。

BACK INTO ENGLISH

I have the most fun time.

INTO JAPANESE

私は、最も楽しい時を過す時間。

BACK INTO ENGLISH

Have the most fun at the time.

INTO JAPANESE

当時、最も楽しい時を過します。

BACK INTO ENGLISH

At the time, have the most fun.

INTO JAPANESE

当時、最も楽しい時を過します。

BACK INTO ENGLISH

At the time, have the most fun.