Why are the 2 mutually exclusive? Why cant someone work, to earn a parnassha and spend the rest of the time learning? For some, this may mean going to the office 8 hours a day, for others, 4 others less and others more. The balance can be spent in the beis medrash.
Also, there are many who simply have no hatzlacha sitting in the beis medrash 19 hours a day and lose their ability to sit after an hr, others more.
There is no “right way” or “wrong way”. There is no cookie cutter mold for every person. Your Rav/Rebbe/Madricha can/should/will advise you what is best for you.