If your not a frequent user how long does THC take to get out of your system?

By "system" what do you mean? If you are referring to a urinalysis, then probably 48 to 72 hours, if you are an infrequent user. If you're wondering about any test, the hair follicle test can detect THC up to seven weeks or so. If you're concerned about getting caught, it's simple...don't smoke. I'm not being judgmental, I'm just saying that you have to look at what's important in your life and make your decisions accordingly.