Meaning: very quickly. Further on meaning.
Rewrite 1: in two heartbeats
Rewrite 2: quicker than you can shake a lamb’s tail
Rewrite 3: quicker than you can say, “lamb’s tail”
Rewrite 4: faster than you can say, “Get it.”

Comment: This one was a little harder that I thought it would be to rewrite. Perhaps because you want it to be short but some things need more language to explain or set up the comparison.

More reading about clichés
What I found when I googled “clichés”:
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