How long does one hit of THC out of your system?

This is not technical... but the light effects of one hit (if u even feel annything with one hit) wear off in less than 30 minutes

If you're talking about drug tests, then- 30 days typical for urine and 3 months for hair (unless u shave everything)- however- drug testers can see the amount of THC and so little can be ruled out as second hand smoke- as u can claim that that's what it was-

get more advise on this....