‘And Joseph was thirty years old when he stood before Pharaoh, king of Egypt, and Joseph went out from the presence of Pharaoh and went throughout all the length of Egypt.'
Joseph had thus been in servitude and then in prison for about twelve years (Genesis 37:2). The thirty years may be a round number signifying that he had come to a point of completeness and was of full age for the task facing him (three intensified), but is probably approximately correct.
“Went out from the presence of Pharaoh.” He not only left Pharaoh but carried with him his authority.
“Went throughout all the land of Egypt.” This repetition of verse Genesis 41:45 b is typical of ancient literature which loved repetition for the sake of the hearers.