YOU SAID:

What you do with your free time is none of my business.

INTO JAPANESE

あなたが自由時間にしていることは私には関係ありません。

BACK INTO ENGLISH

It doesn't matter to me what you're doing with your free time.

INTO JAPANESE

暇な時間に何をしているかは私には関係ない

BACK INTO ENGLISH

What I do in my spare time doesn't matter to me.

INTO JAPANESE

空き時間に何をするかは私には関係ありません。

BACK INTO ENGLISH

It doesn't matter to me what I do in my free time.

INTO JAPANESE

空いている時間に何をするかは私には関係ありません。

BACK INTO ENGLISH

It doesn't matter to me what I do in my spare time.

INTO JAPANESE

私が空いている時間に何をするかは私には関係ない。

BACK INTO ENGLISH

It doesn't matter to me what I do in my spare time.