Mine is 7-10 days. I have shelter, water purification and ability to cook and maintain longer if I hunt / fish for food. My pack is 55+ lbs. and the wife's is 35lbs, my son's is about 10. I do have an extensive medical kit. I also have various other pack that I can grab according to the situation. Overall if I can get more food, I could stay comfortably indefinitely. Without extra I could get by at least a week. Without acquiring water I would be pressed for 3 days.