You didn't miss any commas, just saying they matter.
Bachelors degree takes 4 yrs of study. You can get a Bachelor of Arts (BA) or of Science (BS)
Masters is an advanced degree after a bachelors. Usually take 2 yrs in a graduate program.
Doctorate is also an advanced degree. Length of time to get it varies, but a medical doctorate is usually 4+ years. PhD is a doctorate of philosophy. I know someone who completed a PhD in Biochemistry... took about 2 years of research and graduate work. It gets confusing.