Meijer and Walmart store brands of cheap ass white bread are 22 slices, Kroger is 21, and for a name brand example Sunbeam is 22. Nicer bread like Pepperidge Farm or Brownberry/Oroweat tends to be in the range of 16 slices per loaf (baring the thin sliced stuff) though.
I enjoy trying limited time flavors (of various brands and product types) and mystery flavors are no exception. My wife likes to as well so we’ll usually buy a single bottle to share and try. Despite liking the novelty it is pretty rare for me to leave the experience thinking, “I need to clear out the shelves before this goes away.”