I recommend three times a week or as needed. Be sure to sweat occasionally, especially if you're feeling run down. Thirty percent of toxins are emitted through our pores. Cardiovascular exercise is not the only way to sweat. The most luxurious way to sweat is to preheat your bathroom and draw a very warm bath to create a sauna effect.
Regular elimination is another obvious way that toxins are released.
To enhance regularity, eat lots of high water content fresh fruits and vegetables. Another very affective habit is to drink a cup or two of warm water first thing in the morning. Master a very slow exhale. Exhaling slowly triggers the parasympathetic nervous system. Get Plenty of Rest.