The process of earning a doctoral degree may take 2-5 years or more, depending on whether you study full-or part-time. If you're looking to enter certain fields with high government regulation, such as pharmacy, law and all types of medicine, you usually are required to earn a professional degree.
several years ago we mentioned testyourvocab com here on the blog not long ago the site reached its two millionth test result and so the researchers have put together some data most adult native test takers range from 20000 35000 words average native test takers of age 8 already know 10000 words average native test takers of age 4 already know 5000 words adult native test takers learn almost 1 new word a day until middle age adult test taker vocabulary growth basically stops at middle age the most common vocabulary size for foreign test takers is 4500 words
1 The average woman speaks around 5000 words per day whereas the average male speaks around 2000. Apparently.  Working males average 2000-3000, females from 10,000-20000. However, both average about 500-700 words of actual value (i.e. words which have intent to communicate to another person an item of importance to both). This means the ladies add a great deal of filler to their conversation. (and they wonder why men tune them out!)