Answers

2014-07-26T17:34:59+08:00
I think it means, "it can be done shortly or finished fast"
ex.
this short story can be done "at one sitting".

Although correct grammar would say that it will be done IN one sitting. I still used the phrase you gave just to clear it off.

Hope it helped! :)
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2014-07-26T20:36:13+08:00
It can be done shortly or finished fast
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