"Ten individuals died after sustaining their fasts between 46 and 73 days. Victims of war and torturous containment conditions have successfully fasted between 28 and 40 days."
"Medically speaking, most doctors agree that healthy humans can go up to eight weeks without food as long as they have water."
"Obese can live from 3-weeks up to 25-weeks and more without food depending upon initial health and amount of fat"
Just depends what sort of things you do. Under stress, cold, heat or harsh conditions one could die sooner than what one plans for.
I use conservative figure of 4 - 5 weeks. If you last longer...that is a bonus for you.
Now, just because you got some free time from nature before you die of starvation...I'd prep some cause starving to death is not a pretty sight.