YOU SAID:
three months isn't long enough for it to be known
INTO JAPANESE
それが知られるのに十分な3ヶ月ではありません
BACK INTO ENGLISH
It is not three months enough to be known
INTO JAPANESE
知られるのに3ヶ月ではありません
BACK INTO ENGLISH
It is not three months to be known
INTO JAPANESE
知られるのは3か月ではありません
BACK INTO ENGLISH
It is not three months to be known
That didn't even make that much sense in English.