Do you make time budgets how much you can devote time to this or that responsibility? For example, I'm a company owner. I start office hours at 9 and finish at 5. This gives me 40 hours a week that split between the following responsibilities:

1. Processing: 8 hrs
2. Doing predefined: 8 hrs
3. Reading: 8 hrs
4. Managing direct reports: 8 hrs
5. Other: 8 hrs

Not too much time for other stuff...