Usually 2 or 3 rounds… although I will get a strong initial hit from some… after a while you have a reasonable idea of what you’re dealing with quickly… P91 was so definitive, and it affected me distinctly, as well as affecting others into the next day… I continue to waft out some P91 at the moment… one gay guy I deal with became waaaay gay this morning… so yeah, sometimes there is the first blotter test, which is a controlled spray onto paper, and inhaling for 1 minute, then registering initial reactions… see how that tapers down… next will be an on-the-skin test… and in many cases followed by a sex test… as in what happens when you have sex with this stuff in the air ?.. sometimes there is also a group setting follow up, how does it inflect group behaviors ?..