I often ask some of the executives I work with to address a seemingly simple construct. They are asked, "If you had a clone performing your current job exactly as you perform it today, what would you work on?"
The answers are both illuminating and instructional. The new list typically includes the activities the executive should be engaged in and is almost always of greater impact than the clone's list.
The take away? Yes, it's impractical to clone yourself unless you're a sheep. But look to the people around you, your team or third parties. Can you delegate or assign the "clone's work" to them? If the answer is "yes" then why not get started? If the answer is "no" it's probably time to consider what needs to be done to warrant a "yes".