Commentary for Avodah Zarah 133:7

If one eats an amount of prohibited substance equivalent to an olive within the time it takes to eat half a loaf of bread (calculations vary between 2 to 9 minutes) one has transgressed the laws of the Torah and theoretically should be punished by lashes. For instance let’s say some ground pork falls into my stew. If I ate enough of the stew such that it would contain an olive’s worth of pork and I did so within the time it would take to eat half a loaf of bread, I am considered as one who ate pork.