“And it came to pass in the month Nisan, in the twentieth year of Artaxerxes the king, that wine was before him: and I took up the wine, and gave it unto the king. Now I had not been beforetime sad in his presence.”
King James Version (KJV)
2:1 Nisan - Four months after he had heard those sad tidings. The reason of this long delay might be either that his turn of attending upon the king did not come 'till that time: or that 'till then he wanted a fit opportunity to move it to him.