Apparently you can't just put a generic "grocery" as the destination, but if you search for "grocery" and check different results, you'll get 10-15mn for all of them.
That's pretty standard US suburban sprawl, usually under the insanity that is euclidean zoning: entire neighbourhoods zoned exclusively for detached single-family homes, not allowing any business (no bakery, grocery store, florist, no nothing) and no multi-family dwellings.
There are, of course, other supermarkets much closer (2 within walking distance) but they are not quite so big, have a limited choice and are situated in areas which attract a certain class of clientel (known in the UK as Chavs). For him, the inconvenience is worth it - although it does take 3 hours out of my day.
I don't get going to a supermarket at all. We've had groceries delivered once or twice a week from Sainsburys, Ocada, Tesco, Asda, etc for about 10 years.
The concept of walking around a supermarket on a regular basis fills me with dread - all that wasted time and effort.
Not in the US. In the US "in the middle of nowhere" is grocery runs of 50+ miles. 15 miles is a "far out" suburbian hellscape e.g. https://i1.wp.com/cdn-images-1.medium.com/max/1080/1*AEfVhyv... or https://bostonglobe-prod.cdn.arcpublishing.com/resizer/h2N-h...
