The most common though that I see in BJJ is the cervical sprain or strain. The cervical spine is the most mobile segment of the spine however it puts it at a high risk of injury. Cervical sprains/strains are soft tissue injuries. A strain is linked to muscle, while a sprain is linked to tendons.
However, for some people, effects are much shorter and they have to take modafinil 2X per day (albeit this is not that common). For other people, effects can last 20-24 hours. It all depends on how your body processes it.
Adderall XR lasts for about 10 hours. It could vary depending on your own body's metabolism. The IR (immediate release) formulation last for about 6 hours. Since your body seems like it is a slower metabolizer of Adderall, talk to your doctor about switching to the shorter formulation.