Human Limit\nHuman Limit | Duration / Limit\nNo drinking water 3 to 5 days\nNo food 40 to 70 days\nWithout oxygen 3 to 5 minutes\nNo sleep 11 days\nExtreme cold exposure About 30 minutes\nMaximum heart rate 220 beats per minute\nHolding breath Up to 24 minutes\nWalking continuously 30 hours\nComplete isolation 7 days\nBrain without oxygen 4 to 6 mi