40 days and nights, wandering for 40 years. I belive there are a couple of > more but is the way the calandars fell. Or it just happens.

The number forty has significance throughout the Torah, and the Talmud.

For example, when a person becomes ritually impure, he must go to a ritual bath, a Mikveh. The Talmud tells us that a Mikveh must be filled with FORTY measures of water, and a person, must completely submerse himself in it. After being submersed, he leaves the Mikveh ritually pure. It is no accident, that in the story of Noah, the rain poured for FORTY days, and surrounded the world with water. And just as a person leaves a Mikveh pure, so too when the waters of the flood subsided, the world was pure.

According to the Maharal (16th century, Prague), the number FORTY has the power to raise up something's spiritual state. Just as FORTY measures of water purifies a person, and FORTY days of rain purified the world, so too Moses being on Mt. Sinai for FORTY days also had a purifying effect, in that the Jews arrived at Mt. Sinai as a nation of Egyptian slaves, but after forty days they were G-d's nation.

In the Deuteronomy, Moses tells the Jewish people that he had "led them FORTY years in the wilderness," (29:3-4) after he told them that "G-d has not given you a heart to know, and eyes to see, and ears to hear, until this day." So we see, it took the Jewish people FORTY years in the desert before they could understand the things that took place. Accordingly, the Mishna in Ethics of Our Fathers explains that "a man of forty attains understanding." (5:26) (Ethics from Sinai).

Finally, according to the Talmud, it takes FORTY days for an embryo to be formed in its mother's womb.