Lol.
Longest I've gone without food was 7 days. That's of course the IV meth diet. I don't recommend it.
bhaha, yah i know 1 person who didnt sleep for 14 days straight on coke non stop, cept small powernaps.insane.
now, back to the dieting, depending on how fat a person is,600cals and on gear can work for a while, but there will be need for refueling big meals often, and the other factor, standing that through is simply too much, will leave one sitting in lethargy all day.
but its not "too low", if you compare it to big guy whos on all fatburners available and does 2 hrs cardio daily but eats 2000cals,it comes down to the same more or less.
but when too lean, youll just get the flu and thats it,lol.
and if one somehow stands through it anyway, best to look upfront for kidney donor.