Hashem told Avraham that his children would be enslaved in a land not their own for 400 years. Yet we find that they left after just 210 years of actual enslavement. Where are the missing 190 years?
There is an answer suggested that Egypt treated the Jews much worse than they should have, so as we say in ברוך המקום during Seder night:
ש”הקבה חשב את הקץ – Hashem calculated the end. What “end” is this talking about? Hashem hastened the גאולה and reckoned off קץ – 190 (from 400)- leaving us with 210.
In the Haggada we read how וַיְמָרְרוּ אֶת חַיֵּיהֶם – They embittered their lives (Shemos 1:1)
The Vilna Gaon points out how this is very subtly hinted to by the notes. The notes on וַיְמָרְרוּ אֶת חַיֵּיהֶם are קדמא ואזלא, which literally means “they got up and went”. Additionally, the numerical value of this is 190! They were over-embittered to a value of 190, so they got up and went!
R’ Yosef Chaim Sonnenfeld points out that the redemption from Egypt was only completed 7 days after it began, when the Red Sea parted and when Paroh and his army were destroyed, so where is this reflected in historical events?
He answers that the 400 years were counted from Yitzchak’s birth. The extra week is found at his circumcision. Yitzchak was only circumcised 7 days after his birth – so only became Jewish then, and only 400 years from then were the Jews genuinely free.