YOU SAID:
when i'm gone i'll be gone for a long time
INTO JAPANESE
私がいなくなったら私は長い間去ります
BACK INTO ENGLISH
I will leave for a long time when I am gone
INTO JAPANESE
私がいなくても私は長い間去ります
BACK INTO ENGLISH
Even if I do not exist, I will leave for a long time
INTO JAPANESE
私が存在しなくても、私は長い間去ります
BACK INTO ENGLISH
Even if I do not exist, I will leave for a long time
That didn't even make that much sense in English.
