How much oxycodone is needed to fail a hair folicle test?

Don't know if anyone will know the answer to this but 6 weeks ago my boyfriend stumbled upon a bottle of 3.25 oxycodone. He snorted about 15 pills so that's about 60mg. He just got a really good job and they're going to hair drug test him. I know it can detect up to 90 days so I'm freaking out.. Is there anyway he will pass this test?
How much oxycodone is needed to fail a hair folicle test?
Post Opinion