There was just a recent discussion about that in another topic:
Since you are in the Unnerving symptoms
range, you must have between 1400 and 1800 “units” of toxins built up. Assuming you are at the max of 1800, it will last up to 19 days until you’re back down to 0 toxins (unless you consume more food that contains toxins).
However, below 950 units you’ll only get headaches, so you’ll be back to a fighting condition much faster…