These numbers refer to how long a human can survive without oxygen, water, and food.
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This phrase refers to the stages of fasting in some spiritual practices. It symbolizes purification and spiritual growth. Four minutes typically represents a short time of reflection, four days signifies a period of deeper dedication, and forty days represents a more extended period of spiritual transformation.
It would take about 4 hours and 40 minutes.
15 miles would take 22 minutes 30 seconds at 40 mph.
40 millimeters is 4 centimeters.
There are 9 hours between 7:45 am and 4:45 pm.
At Mars' closest approach to earth, about 4 light-minutes, or 0.00267 light-days (rounded).