It might just be a simple spelling error in your transcript or whatever it is that you've got there. They might have misspelled the word sitting as setting. Or you might have misheard it as setting if it was you who were writing that transcript. Anyway, sitting makes more sense and is actually the word you would more likely see used in this context. And if that's the case, it's now all down to a simple dictionary lookup:
A continuous period of being seated, especially when engaged in a particular activity.
'twenty pieces of music is a bit much to take in at one sitting'
'And sure, it is a lot to ask the average museum visitor to sit through eight films in one sitting.'
'The more calories you eat in a sitting, the more likely you are to store them as body fat.'