The fryd carts thc level length of time THC stays in your system depends on many factors such as how much body fat a person has, how much and how often they consume the drug, and the sensitivity of the drug test. THC may be detected in blood or saliva as soon as 2-24 hours after last use. Urine and hair tests have a longer detection window, anywhere from 1–90 days after last use¹². For almost all people, cannabis should disappear or be very low in concentration within 30 days. For infrequent users, it may take 10 days or fewer for cannabis to leave the body¹.