Telling other people to do things doesn't take that much time.
There’s lots of skill involved in finding effective people, developing trust, communicating goals clearly, evaluating outcomes, adjusting.
It doesn't take much time to be the front-man to several organizations. And Musk excels at it. Being the public face of an excelling team that you assembled is a rare skillset (at the level Musk operates).
I don't like the guy, I don't like tsla, etc. But you have to appreciate what he's been able to do. He's clearly not a dumb guy.