Only on the day the Egyptians rushed us out of their country did we produce matza – so why does the Torah insist: Seven days you shall eat matzot…for generations, an eternal statute. Ibn Ezra claims that the clouds of glory kept us moving quickly for the first week and so the people were forced to eat matza for an entire week. Ibn Kaspi and Netziv focus on the eternal statute, if we were to remember this event forever then it’s not enough to devote one day a year. The goal is for Passover to become a part of us and like anything, this takes time – and so we spend a week eating matza and commemorating the Exodus.