The doctorate would take approximately four years post bachelor's to complete. The degree can run up to 60 credits in coursework particular to a specific field of study. The actual length of time...
It is one type of a doctorate (abbreviated PhD) degree from which many fields of study fall under. The doctorate itself is typically the highest level of educational attainment.
For the source and...
I am unsure whether you are asking the abbreviation of doctors, doctor's or doctors' so i will say what I use for each of them.doctors = dr.sdoctor's = dr.'sdoctors' = dr.s'