in one sitting
In a single session; finishing a task in the same period when one sets out to do so.
The bookworm devoured her book in one sitting.
People have success with this method and it gets them excited. It gets them hooked. You can put layers of thick paint on thin paint and that allows you to complete a painting in one sitting. Bob Ross
I meet people at book signings. My record now, for signing, is ten and a half hours in one sitting. David Sedaris
Of course, you always think about how it will be read. I always aim for a reading in one sitting. Joan Didion
Hip hop scholarship must strive to reflect the form it interrogates, offering the same features as the best hip hop: seductive rhythms, throbbing beats, intelligent lyrics, soulful samples, and a sense of joy that is never exhausted in one sitting. Michael Eric Dyson