How long does it take to get an adderall prescription (if I visit a good, expensive doctor)? (Maximum/minimum dates please)

Normally I live in Kazakhstan, yet for the next three weeks I will live in the United States (I am a US citizen and I do have a US passport). I have strong ADD and I really need help (It's frustrating and horrible)! Please tell me how long it takes for a doctor to prescribe any stimulant that will ameliorate my HORRID condition.

Thank you so much,

Mark