In actual practice, of course, it would be highly unusual to have a string of adverbial modifiers beyond two or three (at the most). Because the placement of adverbs is so flexible, one or two of the modifiers would probably move to the beginning of the sentence: “Every afternoon before supper, Dad impatiently walks into town to get a newspaper.” When that happens, the introductory adverbial modifiers are usually set off with a comma.