How many years was Am Yisrael's slavery in Egypt? The Torah's stated period of four hundred and thirty years is difficult to corroborate, for elsewhere the Torah indicates that the period of enslavement could not possibly have extended for so long.  The commentaries strive to reconcile this number with the rest of the chronology that the Torah provides concerning this event. However, if we begin the count with Avraham's initial journey from his birthplace of Ur, we can realize that the story of the descent to Egypt and the enslavement is thus recast as part of a much larger matrix, one that is characterized by the unsettled state of wandering and homelessness. His life of trust, of trial and of eventual triumph is thus reflected in the lives of his descendents, who eventually emerge from the crucible of Egypt as a nation.

Chronology
Slavery in Egypt
Counting the years
Length of exile in Egypt
Pessah
Courtesy of the Virtual Beit Midrash, Yeshivat Har Etzion