'Days' in the Bible

I searched in my heart how to cheer my flesh with wine, my heart yet guiding me with wisdom, and how to lay hold on folly, till I might see what it was good for the sons of men that they should do under heaven all the days of their life.

For of the wise man, even as of the fool, there is no remembrance for ever; seeing that in the days to come all will have been long forgotten. And how doth the wise man die even as the fool!

For all his days are but'sorrows, and his travail is grief; yea, even in the night his heart taketh no rest. This also is vanity.

All his days also he eateth in darkness, and he is sore vexed, and hath sickness and wrath.

Behold, that which I have seen to be good and to be comely is for one to eat and to drink, and to enjoy good in all his labor, wherein he laboreth under the sun, all the days of his life which God hath given him: for this is his portion.

For he shall not much remember the days of his life; because God answereth him in the joy of his heart.

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

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

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

All this have I seen in my days of vanity: there is a righteous man that perisheth in his righteousness, and there is a wicked man that prolongeth his life in his evil-doing.

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

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

Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be joyful: for that shall abide with him in his labor all the days of his life which God hath given him under the sun.

Live joyfully with the wife whom thou lovest all the days of thy life of vanity, which he hath given thee under the sun, all thy days of vanity: for that is thy portion in life, and in thy labor wherein thou laborest under the sun.

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

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

Rejoice, O 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 thou, that for all these things God will bring thee into judgment.

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