“When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.” -Albert Einstein
It's no secret that Elon Musk puts a tremendous number of hours into his work.
It is also said, "Newton, Einstein, Tesla, and few other great scientists were putting too much time in search of truth". As if they were enjoying their time, the work they were doing was like fun to them. Similarly, when I study math sometimes I need someone to remind me "It's time to show you're hungry".
It thus seems like our state of mind can change our perception of time, as pointed out in a previous question on this site.
What can make someone so absorbed in their work that they forget about food?