Charles Ellicott Commentary Esther 1:4

"when he showed the riches of his glorious kingdom and the honor of his excellent majesty many days, even a hundred and fourscore days." — Esther 1:4 (ASV)

An hundred and fourscore days. —As a period of mere feasting, this long time (half a year) is simply incredible, but we must understand it as a time during which troops were collected, and the plan of invasion settled.