According to the Mishnah (Eduyos 2:10), the punishment of the Egyptians
lasted for 12 months. This implies about a month for each plague; some
say that each plague lasted for a week and was preceded by a three-week
warning, and some say the reverse. According to both of these views,
the time between the first and tenth plagues (inclusive) was at least
ten months. But others say that the plagues lasted for only about
10 weeks. In fact, the Torah says that the first plague lasted seven
days (Ex.7:25), and some of the plagues lasted less than seven days;
the darkness lasted three days (Ex.10:23), and the firstborn died at
midnight of one night.
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