I took a few hits from a joint like 4 days before a had a drug test for my job, I hardly ever smoke?

At least a week. If you are a heavy user (which you said you are not) you could get it all out in 2 days. Hope this helps.

Its all about the concentration in the testing sample and werever actual THC or THC metabolites are being tested for.

THC (found in marijuana) may only be detectable in saliva/oral fluid for 2–24 hours in most cases.

2–3 days in blood.

If it was a urine test: 2 to 7 days, up to >30 days after heavy use and/or in users with high body fat.

You skinny and in good shape and that works in your favour. The amount of water you had that day will also determine the concentration of the sample.

It all depends on how much you smoke, how strong the THC content in the weed you smoke, and your metabolism. In some case some have tested positive after 2 weeks of not smoking, and in other cases some test negative only hours after smoking.

Holding Thumbs for you -

Guaranteed fail. It takes 30 days to clear. Your health and build have nothing to do with it.