I'm with Bob Landry.    I put a book in the car to read--always nonfiction--- while Jan goes shopping at Costco, etc. for kids' clothes, etc.   Then it doesn't bother me a bit how long she takes--time reading is never wasted. But I don't sit in the car--Costso always has furniture to sell--often very comfortable couches.

I've even bought some good books at Costco--e.g. the McCullough book on Adams and the recent Chernow book on Washington.