In general, THC metabolites can be present in the urine for as little as 3 days or up to 30 days after the last consumption. THC is generally only present in saliva for approximately 48 hours after dosing and in the blood for approximately 36 hours after dosing. If you're wondering how long it takes to eliminate THC-O from your body, you'll have to be patient. If you're a frequent user of THC, the cannabinoid can stay for weeks.
However, if you only took THC-O once, it should disappear from your body after a few days. It simply depends on the frequency of consumption. The reaction creates acetates and, in this particular case, with THC, it creates THC-O, also known as THC-O acetate. THC-O isn't for everyone, but those who like these kinds of effects are likely to enjoy the THC-O experience.
There have never been any official studies on the optimal dose of THC-O, just a lot of anecdotal reports from people who have tested the effects of THC-O at different doses. Since THC-O is an analog of THC delta 9 (which is a Schedule I drug), it is very likely that THC-O is illegal according to the FAA in the United States and most of Europe.