yeah, i'd say just try to take in as much as possible in each breath. out of a glass on glass bong i can usually clear out the bulk of the measured dose in two white walled hits, hold it for about 10-15 each. more than that doesnt seem to be necessary. if executed correctly, i only have maybe 2 to 3 seconds to maybe wonder, 'did i get enough?' and then WHOOOOOSH. from an outside perspective it seems to be the same deal with that piece. a notably larger 'test subject' (lol) will still take 2 hits to clear their dose. afterward, you can observe a noticeable loss of control as they rip out of/into their own skulls : ) btw, what's the method of ingestion? if your piece doesnt give you very large tokes, i'd say hold it in for less. since you have less vapor for your lungs to process, and will need to get in more to achieve a breakthough dosage. hope that helps!