Regular release Adderall is usually gone from a person's system in 24 to 36 hours. The extended release Adderall is usually out of a person's system in 60 to 78 hours. This can vary from person to person depending on how quickly their body metabolizes the medication.
The half life of Adderall is about 10 hours. If you took one 15 mg tablet at 12 noon, then you would have 7.5 mg in your system at 10:00 pm. It takes approximately 2 days (55 hours) for Adderall to completely leave your system.
If you feel like you need withdrawal help with Adderall, you need to talk to your doctor. Most people will not have these symptoms because Adderall does not stay in your system. It may be other medications that you are feeling.