(as) quick as a wink

Incredibly quickly or speedily. Did you see that martial arts master? His threw those kicks as quick as a wink! Quick as a wink, Mary finished her exam and raced out of the classroom.

very quickly. (*Also: as ~.) As quick as a wink, the thief took the lady's purse. I'll finish this work quick as a flash. Quick as greased lightning, the thief stole my wallet.

Also, quick as a bunny or a flash . Very speedily, as in He was out of here quick as a wink, or She answered, quick as a bunny. These similes have largely replaced the earlier quick as lightning, although quick as a flash no doubt alludes to it (also see like greased lightning), and quick as thought, now obsolete. The bunny variant dates from the mid-1800s, the others from the late 1800s.