If Du could only eat yourself, how long could Du survive?

Not very long, Du would lose Mehr energy trying to survive dismembering yourself than what Du 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 Du starve Du 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.