How long does it take to replicate Friedrich Wohler's synthesis of urea?
OK, I am not answering the question but the author Kyros might be interested in how Professor Benjamin Silliman, Sr. (1779-1864) described Wohler's synthesis in his Elements of Chemistry (1831) (Vol II, pg.600) just 3 years after the landmark experiment.
Although Silliman conceded that the properties of the &quot;artificial&quot; urea had the properties of urea, he appears to have been skeptical. Wohler wrote to his mentor J. J. Berzelius in Sweden about his discovery on how he, Wohler, could make urea without the need of kidney, be they animal, human or dog. Berzelius was delighted because the reaction was an example of isomerism, a term Berzelius had coined.

Preparation. — By double decomposition, by muriate of ammonia and cyanate of silver; or by single decomposition, by cyanate of lead and liquid ammonia. In this second process, the oxide of lead is liberated and a compound is obtained, in colorless rectangular prisms. In their properties, they are identical with urea, and their composition is exactly the same; they give the same results in analysis as cyanate of ammonia, provided 1 equiv. of water is supposed to exist in that salt.
Still the artificial urea, although from the mode of its formation it would appear that it contains only cyanic acid and ammonia, yields neither, by chemical agents. Potassa does not evolve ammonia, nor do the stronger acids give carbonic acid and evolve cyanic acid, with the peculiar odor which appears when the cyanates are decomposed by a stronger acid. The artificial urea gives no precipitate with salts of lead or silver.*