So if you are taking a three credit hour class (which is standard) then you would expect to spend about 6 to 9 hours per week studying for that class. Just to clarify, in this example studying includes homework, reading, projects, and everything else you have to do for a college class.
Dextroamphetamine and amphetamine is also started at a low dose, usually 5 mg and may be gradually adjusted by your doctor. The maximum daily dose is 40 mg to 60 mg per day. Children are often started at 2.5 mg a day, and gradually increased to a maximum of 40 mg per day.
Most people take 25 to 50 mg a day when taking Adderall. Doctors usually start adults on a low dose of Adderall and increase the dosage as necessary to achieve the desired results.  Answer:  If you mean the average starting dose of Adderall, then probably 5mg.  These are the other dosages available: 7.5mg, 10mg, 12.5mg, 15mg, 20mg, and 30mg.