If あなた could only eat yourself, how long could あなた survive?

Not very long, あなた would lose もっと見る energy trying to survive dismembering yourself than what あなた could ever hope to gain from eating yourself.

why would i do that?
i will only cause myself pain and bleed to death
so i'll just starve to death ,well i am dead both ways.so..fuck

Id like to mention that when あなた starve あなた are basically eating yourself regardless.

Refer to Kragfan's reply

54 years

OOOH MAN THATS A TOUGH 1, I REALLY DON'T KNOW.

Hmmm if there is water then I can pretty sure survive for a long time.