at one sitting

at one sitting

During one uninterrupted period of time. Our teenage sons can finish a whole turkey at one sitting. How much research can you get done at one sitting?
See also: one, sitting
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

at one sitting

or

in one sitting

COMMON If you do something at one sitting or in one sitting, you do not stop doing it until you have finished it. He sometimes reads a whole novel at one sitting. She can go through a whole box of cookies in one sitting.
See also: one, sitting
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

do something in/at one ˈsitting

do something in one continuous period of activity, without getting up from your chair: I read the book in one sitting.
See also: one, sitting, something
Farlex Partner Idioms Dictionary © Farlex 2017
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References in classic literature ?
Then twelve roasted oxen and twelve tons of bread were brought alongside of the ship, and at one sitting the glutton had devoured it all.
But children born to mothers who drink heavily or binge drink (seven or more units a week or six at one sitting) are at higher risk of behavioural and emotional problems.
A BURGER and fries meal or a trip to a pizza restaurant can lead to children and adults eating half their recommended daily calories or salt at one sitting, research suggests.
Women were also asked if they binged on alcohol (consumed at least five drinks at one sitting) during each period.
Never has the company looked so good and offered so much variety at one sitting. The grand finale tableau of all the company onstage was performed to the last moments of Stravinsky's Firebird, when a young Royal Ballet School boy and girl solemnly climbed upwards to join their fellows--the future custodians of the Royal's heritage, who will soon appreciate the advantages of having a permanent home.
An attempt is being made to set a new world record for the most number of people having their heads shaved for charity at one sitting.
You can read this book at one sitting, or pick it up for a nugget or two of information whenever you want.