How long does it take priority mail to get from Wisconsin to Connecticut?

US mail goes from the local site to a processing center and then is sent to another processing center and then on to the delivery post office. There may be only one delivery per day a each connection and none on Sunday, so the time varies. Five days seems to be average, but three is not rare and the IRS says to allow ten .

You can get confirmation of delivery for a small extra fee and see a trace of your mail on-line.