Why did Achashverosh's feast last so long?

Avodah
1

The following is from the Sefer The Vilna Gaon on Megillas Esther by Rabbi Asher Baruch Wegbreit. This Sefer contains many interesting insights into the Megillah.

Pasuk !:4 says "when he showed the riches of his glorious kingdom, and
the splendor of his excellent majesty, many days, one hundred and eighty days."

Question: Why did Achashverosh's
feast last so long?

Answer: The answer lies in
understanding the real purpose
of the feast. Vashti's grandfather
Nevuchadnezzar had hidden 1,080
treasure houses near the Euphrates
River, but Hashem revealed them
to Koresh, the king who preceded
Achashverosh, because Hashem had
designated Koresh to rebuild the Beis
Hamikdash. Achashverosh inherited
these treasures from him.

Achashverosh decided to display
his vast wealth to the officers and
noblemen of all the provinces of his
empire in order to awe them into
submission and thereby solidify his
kingship, and he used the feast as
a context for the presentation. The
feast was thus a pretense to allow
what would have otherwise been
ostentatious display of his wealth. The
pasuk describes this in passive form
"in his showing of his treasures,"
to hint that this display, which was
actually the purpose of the feast, was
conducted in a casual manner, as if it
were merely a secondary goal.

Achashverosh showcased his
1,080 treasure houses at a rate of
six per day- as alluded to in the
six words in the pasuk describing his
wealth and power ("riches," glorious,"
"kingdom," "honor," "sp1endorous, "
and "greatness")-on each of the 180
days of the feast (180 x 6 = 1,080).

At the feast, Achashverosh also
donned the Kohen Gadol's garments,
to convey his personal greatness and
royal dominion.

2

See Malbim, who sees the whole story as a political struggle between Achashverosh and the political establishment. Bavel had been a constitutional monarchy, its kinds bound by the law, and remained so after the Persian kings conquered it. But Achashverosh, having usurped the throne, was not content with this and wanted to change it to an absolute monarchy, where the law is subject to the king, and all the country's wealth is his to spend as he pleases.

So he unilaterally moved the capital to Shushan, which had never been an important city before, and then started spending untold fortunes on an endless party, at which his own appointees, servants, and armies were honored ahead of the statesmen and ministers who had been there before him. He was rubbing their faces in the new reality. Then, once he felt that point had been made, he punctuated it by throwing a party for all the commoners whose only yichus was that they happened to live in his new capital city, and at the peak of this party he summoned Vashti, the princess of the ancien regime, to humiliate her and show that she is subject to his whims, because his authority does not derive from her but from his own might.