With sufficient nutritious food and plenty of water, a person can survive indefinitely.
A person can survive indefinitely if that person has sufficient food and water.
The Atacama Desert is classified as a 'cold' desert where temperatures rarely rise above 75 or 80 degrees F. in the summer. If a person limits physical activity he/she might survive a few days (2-4) without water.
A Long Time
That would depend upon a number of factors. How serious is the person's illness? Does he have medical care? Does he have sufficient water and food and shelter? If the person does not have a life threatening illness and is living in a town or city in the desert with water and food, that person can survive indefinitely. Thousands upon thousands of people are in that situation everyday.
With sufficient water and food a person could survive indefinitely. Without water, just 2-3 days in the summer months.
Without some heavy-duty protective gear, you don't have a chance.
They can survive indefinitely as long as the food is nutritious and they have plenty of water.
Abyssinian cats are a domestic breed and would not survive for long in a desert.
Not for very long. People cannot survive for very long without water, anywhere.
Very hard. Without water, a person will not last long. It takes a specialized form of life to survive in the little/no water dessert. People can die in a desert very quickly without enough water to live.
As long as a person has proper clothing and sufficient water, a person can remain outside in a desert biome indefinitely.
The pet desert can survive without eating for a few months.