For most of my adult life I have worked two full-time jobs, because choosing between them is not an option for me. In my day job I am a philosophy professor, and I moonlight as an artist. The two fields are very different. Academic philosophers teach, do research, serve on committees, and give talks. Artists who teach do all this, and also produce, document, market, exhibit, and sell their work. But the two jobs are alike in that the more success you have in either, the harder it becomes to manage the workload without assistance. Successfully managing both at once without assistance is physically impossible.