'Number' in the Bible

I have sought in my heart to draw out with wine my appetite, (and my heart leading in wisdom), and to take hold on folly till that I see where is this -- the good to the sons of man of that which they do under the heavens, the number of the days of their lives.

Lo, that which I have seen: It is good, because beautiful, to eat, and to drink, and to see good in all one's labour that he laboureth at under the sun, the number of the days of his life that God hath given to him, for it is his portion.

For who knoweth what is good for a man in life, the number of the days of the life of his vanity, and he maketh them as a shadow? for who declareth to man what is after him under the sun?