The only way you can make these notes real real quick is it's is so fracking black and white as to whether or not the patient will be admitted or discharged, and if you really went too fast on it, I could see a doc messing up once in awhile.
Where I'm at, 40 minutes per patient is a very fast speed but IMHO it's because there's too much paperwork involved. Billing, dictating, signing off the med reconciliation sheet, the 72 hour hold papers, admission orders, calling the floor to see if there's a bed open, making sure if the patient has the right insurance for which hospital, signing the medication consent forms takes a long time.
Where I did my training all I had to do was admission orders, a brief H&P, and 72 hold forms and the staff handled the rest. In those situations, if it was black and white I could get it done in 20 minutes on a good day.