No stimulant medications last 24 hours. If they did, most people wouldn’t get any sleep. Concerta lasts up to 12 hours after taking it — the exact time depends on your metabolism and genetics. On occasion, I hear of people taking two doses of a long-acting stimulant a day, but the more common scenario is to take a short-acting stimulant as a booster when the long-acting medication is wearing off.
Here’s more on Concerta:
Ultimately, you need to discuss this with your doctor.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism