Because energy is limited and TBH very few people are really fit for doing two jobs properly at the same time. Honestly, sometimes, or most of the times, a grea

Because energy is limited and TBH very few people are really fit for doing two jobs properly at the same time. Honestly, sometimes, or most of the times, a great career do demand more than 40 hours of work. You also need very good mental for both jobs, too.