'scholar':
The siege lasted for 18 months for the idea that the
siege lasted for about two and a half years-36 months according to Carl
Jonsson (GTR,2004, p.348) or 30 months according to Jeffro is
preposterous and conflicts with the precise period of 18 months in 2Kings 25:1-4
No, doofus. (And no deference to Jonsson is required.) The author of 2 Kings demonstrably used Tishri-dating for Judah, but the "10th month" is always Tevet. Therefore, the siege ran from January 589 BCE until mid-587 BCE.
The duration is confirmed by direct statements from Ezekiel:
(Ezekiel 24:1, 2) The word of Jehovah again came to me in the ninth year, in the tenth month, on the tenth day of the month, saying: 2 “Son of man, record this date, this very day. The king of Babylon has begun his attack against Jerusalem on this very day.
(Ezekiel 33:21) At length in the 12th year, in the tenth month, on the fifth day of the month of our exile, a man who had escaped from Jerusalem came to me and said: “The city has been struck down!”
And no, there is no reason to conclude that it took someone 18 months to reach Ezekiel with the news of Jerusalem's destruction, by which time he would already have heard from people who were exiled to Babylon in 587 BCE. And the Watch Tower Society agrees that Ezekiel found out about 6 (not 18) months after Jerusalem's destruction anyway (The Watchtower, 1 August 2007, page 8):
About six months after the destruction of Jerusalem in 607 B.C.E., an escapee comes and reports to Ezekiel: “The city has been struck down!”
Poor 'scholar', the Watch Tower Society shill.