From one of my favourite sites, Farnam Street: Your First Thought is Rarely Your Best Thought
Most people schedule themselves like lawyers. They work in five- to eight-minute increments, scheduled back to back. The best part of their day is when they manage to sneak away for a quick coffee with a friend before heading into the next meeting they haven't had time to prepare for.
I actually schedule time to think. It sounds ridiculous, I know, but I protect this time as if my livelihood depended on it because it does.
I just wrote about thinking time because you need it in your business. If you don’t have time to sit back and think about your work, the business is broken.
You should be able to spend at least 10% of your time on educating yourself and I include thinking time in this. This is outside of my runs which I do without music or podcasts (sometimes).
This is time where I’m focused on thinking about my business so that I can improve it.