It is very dangerous to go longer than a week without food. At that point, the body can have serious damage done to it. On the other hand, it is still not healthy to go without eating for even a day.
At least a week.
A few months.
well atleast a day
My daughter's doctor & hospital have always made sure they were given 1 hour pre-operatively.
A heart monitor
It depends on what your experiment was. You should ask a teacher or someone that you know who has done this before.
Before beginning a long outing on eh water, always tell someone who is NT going with you where you intend to be, and when.
Don't wait, go as soon as possible, usually the quicker something is treated the better the outcome.
That depends on the hospital doctors.
it is all up to the hospital
He was not taken to a hospital but to a nearby rooming house. He died at 7:22 am, the next morning.
I would wait at least a year, since getting to know people is not easy.