In no time flat phrase
Very quickly; in a short period of time
The incident happened in no time flat.
He is such a genius. He can solve this complicated equation in no time flat.
Very quickly
Very fast.
Quickly and effortlessly
The origin of this phrase is not clear.
Used to allude that the last force, problem or burden which is seemingly minor and small causes a person, system or organisation to collapse or fail
Her husband's violent act last night was the straw that broke the donkey's back and she left him