תּלמוד אויף בראשית 40:5

but at that time his mother was no longer living.

R. Levi said : A man should always wait up to twenty-two years for [the fulfilment of] a good dream. Whence is this learnt ? From Joseph ; for it is written, "These are the generations of Jacob. Joseph, being seventeen years old" etc. (ibid. v. 2), and it is written, "And Joseph was thirty years old when he stood before Pharaoh" (ibid. xli. 46). From seventeen to thirty — how many years is it? Thirteen ; add the seven years of plenty and two of famine, hence we get twenty-two.

Rab Huna said : A good man is not shown a good dream and a bad man is not shown a bad dream.