'Forty Days' in the Bible

When I was gone up onto the mountain to receive the tables of stone, even the tables of the covenant which the LORD made with you, then I stayed on the mountain forty days and forty nights; I neither ate bread nor drank water.

It came to pass at the end of forty days and forty nights, that the LORD gave me the two tablets of stone, even the tables of the covenant.

I fell down before the LORD, as at the first, forty days and forty nights; I neither ate bread nor drank water; because of all your sin which you sinned, in doing that which was evil in the sight of the LORD, to provoke him to anger.

So I fell down before the LORD the forty days and forty nights that I fell down, because the LORD had said he would destroy you.

I stayed on the mountain, as at the first time, forty days and forty nights: and the LORD listened to me that time also; the LORD would not destroy you.