YOU SAID:

the old cow will need her tail come fly time

INTO JAPANESE

古い牛は彼女の尻尾が飛ぶ時間を必要とします

BACK INTO ENGLISH

Old cow needs time for her tail to fly

INTO JAPANESE

老牛は尻尾が飛ぶのに時間がかかる

BACK INTO ENGLISH

Old cow takes time to fly its tail

INTO JAPANESE

老牛は尻尾を飛ばすのに時間がかかる

BACK INTO ENGLISH

Old cow takes time to fly its tail