'During' in the Bible

Here is what I have seen to be good and fitting: to eat, to drink and enjoy oneself in all one’s labor in which he toils under the sun during the few years of his life which God has given him; for this is his reward.

For who knows what is good for a man during his lifetime, during the few years of his futile life? He will spend them like a shadow. For who can tell a man what will be after him under the sun?

I have seen everything during my lifetime of futility; there is a righteous man who perishes in his righteousness and there is a wicked man who prolongs his life in his wickedness.