'Forty Days' in the Bible

When I was gone up into the mount to receive the tables of stone, even the tables of the covenant which the LORD made with you, then I abode in the mount forty days and forty nights, I neither did eat bread nor drink water:

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

And I fell down before the LORD, as at the first, forty days and forty nights: I did neither eat bread, nor drink water, because of all your sins which you sinned, in doing wickedly in the sight of the LORD, to provoke him to anger.

Thus I fell down before the LORD forty days and forty nights, as I fell down at the first; because the LORD had said he would destroy you.

And I stayed in the mount, the same as the first time, forty days and forty nights; and the LORD hearkened unto me at that time also, and the LORD would not destroy you.