What is the length of vyvanse (lisdexamfetamine) and adderall withdrawal?

There is none: Because these medications have such a short half life, there is virtually no 'withdrawal'. One can experience a 'rebound' effect when the medications wear off including irritability, agitation and moodiness which may last a few hours.

There is none: These are short acting medications . They do not stay in your body long enough to result in any withdrawal.

Fatigue: After long term use of stimulants, some people will complain of prolonged fatigue when stopping them. This is usually temporary but can be distressing for up to 2 weeks.