before you know it

“I’ll be back before you know it.”

“Because before you know it, it’ll be winter, and we’ll want to welcome visitors.”

“You’re at a weird spot in your life and you let someone in and before you know it they’re taking advantage. That made sense to me.”

Before you know it, he's got his own trailer and a starring role, and the Western becomes a hit.

They just see play, and before you know it you went the whole day without stressing because you’re coloring or running around or swimming or whatever.