There are several factors that play into how long CBD will remain in your system including metabolism, BMI, frequency of CBD use, CBD dosage, and method of administration (sublingual vs. topical vs. edible). A slower metabolism will mean that it will take longer for the CBD to leave the system. The food in your digestive system at the time of ingestion can also affect the bioavailability in your body, meaning that certain foods can increase the absorption of CBD.
Sublingual ingestion (placing a dose under the tongue) is considered to be more effective than ingestion. “Effective” in this scenario means a higher amount of absorption in a shorter period of time.
There is still not enough research regarding the toxicology of CBD and how long it is detectable in blood or urine. Existing research indicates that CBD will most likely leave the system within 1-2 weeks.