I took 4 adderalls in a 2 week span to travel 70 days ago. i dont have a prescription. i have a 7 panel drug test in 3 days will i fail?

Probably not. The half life is the term used to describe when 1/2 of a drug has left the system. For Adderall it is listed as 10 hours. After ~4 half lives it is considered gone from the system, so common pee or blood tests should not detect it. Some facilities test hair samples where it may be detected within hair growing at the time of use.

You will not fail for using Adderall 70 days ago, your behavior remains high risk as using unprescribed amphetamines and that will place you at high risk for undesirable events, random tox screens included. This is the right time to completely stopping using high risk illegal drugs.