On the morning of the grocery shopping day, I'd guess most families do not have 7 days of food left to eat.
In America, the average # of grocery trips per week was ~2.[1]
That frequency doesn't seem so strange if the number of trips is affected by: (1) family size such as 4 people including 2 parents + 2 children, (2) refrigerator size of typically less than 20 cu ft (not the luxury 28+ cu ft or extra refrigerator in the garage), and (3) preference for fresh & perishable food instead of canned items.
[1] https://www.statista.com/statistics/251728/weekly-number-of-...
Is it horribly wasteful and inefficient? yes. Does that get factored into the equation? no.
Emergency food is emergency food.
My emergency supplies have food, but I don't eat the emergency food unless there is an emergency.
I cant tell if this is a serious question? I definitely do not have more than 1 weeks worth of food in my home.