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The U.S. Postal Service advertises that first-class mail — your average letter with a 55 cent stamp — arrives within “1-3 business days.” That is an official standard set by the Postal Service. We decided to test it. https://www.wgbh.org/news/local-news/2021/04/23/we-mailed-100-letters-to-test-the-postal-service-we-did-not-get-speedy-delivery