'Days' in the Bible

I explored with my mind how to gratify myself with wine while [at the same time] having my mind remain steady and guide me wisely; and how to take control of foolishness, until I could see what was good for the sons of men to do under heaven all the days of their lives.

For there is no [more] lasting remembrance of the wise man than of the fool, since in the days to come all will be long forgotten. And how does the wise man die? Even as the fool!

For all his days his work is painful and sorrowful; even at night his mind does not rest. This too is vanity (worthless).

All of his life he also eats in darkness [cheerlessly, without sweetness and light], with great frustration, sickness, and anger.

Behold, here is what I have seen to be good and fitting: to eat and drink, and to find enjoyment in all the labor in which he labors under the sun during the few days of his life which God gives him—for this is his [allotted] reward.

For he will not often consider the [troubled] days of his life, because God keeps him occupied and focused on the joy of his heart [and the tranquility of God indwells him].

If a man fathers a hundred children and lives many years, however many they may be, but his soul is not satisfied with good things and he is not respected and is not given a proper burial [he is not laid to rest in the sepulcher of his fathers], then I say, “Better the miscarriage than he,

For who [limited by human wisdom] knows what is good for man during his lifetime, during the few days of his futile life? He spends them like a shadow [staying busy, but achieving nothing of lasting value]. For who can tell a man what will happen after him [to his work, his treasure, his plans] under the sun [after his life is over]?

Do not say, “Why were the old days better than these?”For it is not from wisdom that you ask about this.

I have seen everything during my [fleeting] days of futility; there is a righteous man who perishes in [spite of] his righteousness, and there is a wicked man who lives a long life in [spite of] his wickedness.

Though a sinner does evil a hundred times and his life [seemingly] is prolonged [in spite of his wickedness], still I know that it will be well with those who [reverently] fear God, who fear and worship Him openly [realizing His omnipresence and His power].

But it will not be well for the evil man, nor will he lengthen his days like a shadow, because he does not fear God.

Then I commended pleasure and enjoyment, because a man [without God] has no better thing under the sun than to eat and to drink and to be merry, for this will stand by him in his toil through the days of his life which God has given him under the sun.

Live joyfully with the wife whom you love all the days of your fleeting life which He has given you under the sun—all the days of vanity and futility. For this is your reward in life and in your work in which you have labored under the sun.

Cast your bread on the surface of the waters, [be diligently active, make thoughtful decisions], for you will find it after many days.

Yes, if a man should live many years, let him rejoice in them all; yet let him remember the days of darkness, for they will be many. All that is to come will be futility.

Rejoice, young man, in your childhood, and let your heart be pleasant in the days of your young manhood. And walk in the ways of your heart and in the desires of your eyes, but know that God will bring you into judgment for all these things.

Remember [thoughtfully] also your Creator in the days of your youth [for you are not your own, but His], before the evil days come or the years draw near when you will say [of physical pleasures], “I have no enjoyment and delight in them”;