in no time

in no time idiom
Also, in no time at all; in less than no time; in nothing flat. Almost instantly, immediately, as in The train will be here in no time at all, or He'll be finished in less than no time, or I'll be there in nothing flat. All these hyperbolic terms equate a very short time with “at once.” [First half of 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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