I've been doing this for a couple decades now, and I've never had a job where I had to put in more than 40 hours on a regular basis. At most I've put in a few extra hours due to some rare circumstance a few times per year.
I realize now that some people might have mistaken my comment to mean that I'm the person who created the USB-C MIDI synth. I meant that I've been working as a software engineer and have plenty of free time.
There are better employers out there.