How long does it take THC to get completely out of your body?

30 days.

Fat cells will retain the THC for one time heavy use, leaving trace evidence of use for 3-10 days. For use at least 5 days a week or more the THC will remain up to 30 days in the human body for 50 Nano-grams of trace THC evidence use using a urine sample; hair samples can show use for 120 days.

If properly done 21 days can meet the 50 Nano-gram urine sample test measure.

THC is not water based; therefore burning of fat will 'reject' THC. This process normally takes 30 days.