So if vyvanse (lisdexamfetamine) takes longer than an hour to kick in i am extremely confused. when would the peak hours of studying be?

The Best Fit For You: How anyone reacts to any adhd medication is going to be unique; it's important to have good communication with your prescriber, and work together to make the medication work well. It is important to pay close attention ( no pun intended) to how soon you can tell an effect and how long it lasts. Over time you should be able to reliably predict the best schedule.

Depends.: Vyvanse (lisdexamfetamine) is used to control symptoms of add/adhd and not to be used for enhancement of memory prior to taking a test. The onset of action is gradual since it is a n extended release medication .Not a good idea to use it if you don't have add/adhd.