Yes, doing two full-time things at the same time is an illusion. Obviously there are people who studied several subjects. Of those that I know better I realized

Yes, doing two full-time things at the same time is an illusion. Obviously there are people who studied several subjects. Of those that I know better I realized they got sub-optimal grades and/or had to extend there study time. Contacts and continuously growing your network in the areas you are good at or at least highly interested with basic knowledge is also key. But at the same time a lot of work is necessary but in a single position though. Not to forget that many people who "did it" financially might have done that on the cost of other people, may it be friends or family. But yes, it boils down to trading life for work.