Esther 1:5

And when these days were expired, the king made a feast unto all the people that were present in Shushan the palace, both unto great and small, seven days, in the court of the garden of the king’s palace;

Cross-references

2 Chronicles 7:8 describes Solomon's seven-day festival for all Israel, paralleling the seven-day banquet here.

In 2 Chronicles 30:21-25, Hezekiah's Passover also features a seven-day feast for all people, mirroring the length and inclusiveness of Ahasuerus's feast.