You can get lots done by working 12 hours a day while spreading yourself across multiple tasks and having background distractions sucking up attention and cognitive “bandwidth.”
But you can get just as much done by having two blocks of three very dense hours of work without distractions, background noise, or stuff stealing attention from you.
That’s six dense hours of work that allow you to have six free hours, where you’re not quite playing, but barely working as well.
Trim the fat, cut out distractions, no phones or social media, no background podcasts or music. Just a pure focus on work. A meditative experience.
Note: It’s very difficult at first, but like any workout, the more you do it, the easier it becomes and the better at it you will become.