'Days' in the Bible

I searched in my heart how to cherish my flesh with wine, while practising my heart with wisdom; and how to lay hold on folly, till I should see what was that good for the children of men which they should do under the heavens all the days of their life.

For there shall be no remembrance of the wise more than of the fool for ever; because everything is already forgotten in the days which come. And how dieth the wise even as the fool?

For all his days are sorrows, and his travail vexation: even in the night his heart taketh no rest. This also is vanity.

All his days also he eateth in darkness, and hath much vexation, and sickness, and irritation.

Behold what I have seen good and comely: it is to eat and to drink, and to enjoy good in all his labour wherewith man laboureth under the sun, all the days of his life which God hath given him: for that is his portion.

For he will not much remember the days of his life, because God answereth him with the joy of his heart.

If a man beget a hundred sons, and live many years, so that the days of his years be many, but his soul be not filled with good, and also he have no burial, I say an untimely birth is better than he.

For who knoweth what is good for man in life, all the days of his vain life which he spendeth as a shadow? for who can tell man what shall be after him under the sun?

Say not, How is it that the former days were better than these? for thou dost not inquire wisely concerning this.

All this have I seen in the days of my vanity: there is a righteous man that perisheth by his righteousness, and there is a wicked man that prolongeth his days by his wickedness.

Though a sinner do evil a hundred times, and prolong his days, yet I know that it shall be well with them that fear God, because they fear before him;

but it shall not be well with the wicked, neither shall he prolong his days as a shadow, because he feareth not before God.

And I commended mirth, because there is nothing better for man under the sun than to eat, and to drink, and to be merry; for that shall abide with him of his labour the days of his life, which God hath given him under the sun.

Enjoy life with the wife whom thou lovest all the days of the life of thy vanity, which he hath given thee under the sun, all the days of thy vanity; for that is thy portion in life, and in thy labour wherein thou art labouring under the sun.

Cast thy bread upon the waters; for thou shalt find it after many days.

but if a man live many years, and rejoice in them all, yet let him remember the days of darkness; for they shall be many: all that cometh is vanity.

Rejoice, young man, in thy youth; and let thy heart cheer thee in the days of thy youth, and walk in the ways of thy heart, and in the sight of thine eyes; but know that for all these things God will bring thee into judgment.

And remember thy Creator in the days of thy youth, before the evil days come, and the years draw nigh, of which thou shalt say, I have no pleasure in them;