The absolute deadline for eating chametz is the morning before Passover, it is forbidden to eat chametz until the close of the festival in eight days.
By this time, the chametz should be sold and burned, and there should be no chametz remaining in your possession, except what you need for Shabbat - to be kept isolated in a special place and eaten by Saturday 12.4.25 before 10:27am, or discarded and nullified by Saturday 12.4.25 before 11:23am. This is so as Pesach 2025 begins on Saturday night.