“The couriers riding the post-horses used in the royal service went out urgently and speedily at the king’s order.”
~Esther 8:14

Once King Ahasuerus authorized Mordecai to create laws that enabled the Jews to defend themselves from attackers, the law was promulgated urgently throughout the kingdom.
This happened late in the Jewish month of Sivan (mid-June).
Haman, who was now dead, had superstitiously scheduled their genocide for the month of Adar in the next year (early March) (Es. 7:10; 8:11,12).
This means the Jews had 8 and a half months to prepare themselves for the attack.
They did not slack in getting the word out, but did so with urgency, knowing that the more time people had to prepare themselves, the more likely they were to survive.
This reminds me of the life-saving preaching work we carry out, letting our neighbors know God’s day is near (1 Tim. 4:16).
Although we do not know the exact date, if we preach with a sense of urgency during these last days, we will give people more time to prepare themselves and be saved (Matt. 25:13; 2 Tim. 3:1-5, 4:2).