How detailed talk should a dr visit be for diabetic to determine a significant progress, what are best question to ask. My doc barely talks 3 minutes.

Longer than 3 minute. It's best to come to a visit prepared with notes listing questions, concerns, issues, and advice needed...I as a surgeon do when i go to my cardiologist. You as a patient should expect in general 10 to 15 minutes of face time perhaps more depending on the issues involved.
Just say. Just say, doc please explain to me what is going on and what is required of me for the best outcome. Please talk to me like as i were your son or daughter. This should do the trick. Good luck from nyc.