We spread out a blue tarp for the picnic.

Do you understand the necessity of this project?

That information is unnecessary.

That information is completely unnecessary.

He thinks that war is a necessary evil.

He challenged the time attack in cycling and updated his personal best record.

He likes to speedrun new games.

Let's go to see a movie during the golden time.

When summertime begins, you need to set your clock an hour ahead.

He got absorbed in the game and ended up creating a lot of wasted time.