The highest dosage of L-dopa needed was 21,000 mg(or 52,500 mg of mucuna standardized to 40% L-dopa) as stated in this paper - https://neurosupport.files.wordpress...tted-paper.pdf

With your father he could be anywhere throughout the range of 240 mg to 21,000. As you stated it is specific to each individual and the amount of damage that has occurred in the brain. The more damage the more that is needed. Given the fact that your father has severe parkinsons symptoms, he will likely need quite a bit of L-dopa to be able to control it. But you also need to balance it against 5-htp and L-Tyrosine for it to work effectively and control side effects.

Here is a case study of a parkinsons patient treated by Dr. Hinz - https://neurosupport.files.wordpress...-parkinson.pdf

Dr. Stein usually responds pretty quickly to emails so you should get a response soon. If for whatever reason you dont get a email back over the next few days, let me know and I will get in contact with him on your behalf.