You will find the instruction for the Preparation for Passover in the Haggadah. That book has outlined in VERY SPECIFIC DETAILS exactly how the Passover is to be prepared for, and how is it is to be Celebrated. EVERY DETAIL has symbolic meanings. The process of preparing to celebrate, took as long as two days, depending on how many people were helping. Getting the leaven out was not as simple as taking the bread out of the house. EVERY plate, every bowl, every utensil and knife that had ever touched leaven had to be packed up and stored outside the house. EVERY Jewish home has two sets of dishes, one for normal use and one for Passover. Every counter, every square inch of anything that had ever touched leaven had to be scrubbed. Pets had to be sold, so that Gentiles could feed them, because only the Passover food could be served to men or pets, during Passover. Now in modern times they do have some kosher pet foods available, but in the old days they sold their pets only to buy them back after Passover. They bought their pets back after Passover, usually for more than the sold them for.
HERE is a Jewish site outlining most of the details, and I think you will see that the Preparation took more than one day:
Preparing for Passover | Jewish Virtual Library
ZLM Video: “Passover/Unleavened Bread”
ZLM Video: “Messiah in the Passover”
