YOU SAID:

I don't know how much longer I can keep her from hurting herself!

INTO JAPANESE

彼女が自分を傷つけないようにどれだけ長くできるかわかりません！

BACK INTO ENGLISH

I don't know how long she can do so as not to hurt her!

INTO JAPANESE

彼女を傷つけないように、どれだけ長くできるかわかりません！

BACK INTO ENGLISH

I don't know how long I can do so as not to hurt her!

INTO JAPANESE

彼女を傷つけないように、どれだけ長くできるのかわからない！

BACK INTO ENGLISH

I don't know how long it can be so as not to hurt her!

INTO JAPANESE

彼女を傷つけないようにどれくらいの時間がかかるのかわかりません！

BACK INTO ENGLISH

I don't know how long it will take to not hurt her!

INTO JAPANESE

彼女を傷つけないのにどれくらい時間がかかるかわかりません！

BACK INTO ENGLISH

I don't know how long it will take to not hurt her!