For how long have you ever gone without eating anything whatsoever? If you ate even a crumb to break the period then it does not count. You may have drunk water or light beverage like orange juice or soda, but nothing heavy like shakes, supplements or blended food.
When I was fifteen, I fasted for 48 straight hours. I was so hungry that I ate at 48 hours on the dime! But the idea was a religious fast so it was self induced. The longest I went without food involuntary was about 36 hours. I was on a canoe trip and our supply boat tipped and it took us 36 hours of powering down the river till we reached a town with a general store in Colorado. That was the worst because we also were working hard at getting down the river since we didn't know how far we had till we could get food.