3 answers
Bruce’s Answer
Many years ago a great friend of mine taught me the below which has turned out to be very true:
18 years old = you know everything
21 years old = you know you know everything
25 years old = you begin to doubt
30 years old = you begin to learn !
Good Luck in your endeavors !
Al’s Answer
That depends on your career goals. Spending some time focusing on what you want to do will help in answering your question. Reflect on what you like, dislike, and want to do in life. Once you determine what you want to do then you can start your career planning. This will help you understand how long it will take to learn a specific subject or career. Here’s an article that provides 11 tips for career planning - https://www.livecareer.com/resources/careers/planning/career-planning-tips