For @patrickc's Fast, the telegram. IMO the striking part isn't construction time, but the speed that congress approved money.
1838 Morse sought sponsorship, but denied.
Dec 1842 he wires 2 rooms in the capital to demo.
Mar 1843 Congress approves $30K to build a 38-mile demo 
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(that's $900K today's dollars) Fall of 1843 Morse contracts someone to make custom plow to dig a trench besides train tracks to lay cable. Poor insulation, it fails by the time it reaches Relay (which was named after horse relays not wire ones!). He spent half the money.
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He tries again: string the cable on poles. Much faster! April 1st, 1844: Work begins laying poles and wire May 1st, 1844: Over half done. May 24, 1844: Incoming message from Baltimore to the Supreme Court chamber: "What Hath God Wrought"
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Sources History of the Baltimore and Ohio Railroad by Stover, p 59-60 Worldwide History of Telecommunications by Huurdeman p 61 Also this may have been the first time the US Congress paid out to support private research, unless you count Lewis and Clark: http://maryannfeldman.web.unc.edu/files/2011/11/Economics-of-Sci-and-Tech_2002.pdf …
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