G. Mark’s Answer
You'll see lists of careers that have great salaries, some that have high maximum potential salaries, or even some careers that make a lot of money compared to the time spent working. There are also careers, medical doctor being one, that have high potential salaries but may entail not only very long hours, but many years and financial investment in education and starting a practice.
Taking all this into consideration along with which career you would expend so much money and time and effort in starting but not mind because you love the job so much would be my advice. I personally worked crazy hours on my job for years and loved every minute of it.