I've seen Elon say he spends about 1% (or something like it) of his time for marketing/presentation preparation. And I think it included press-interviews/presentation-prep/etc.

And he was planning/hoping to reduce it even more.

From what you say, it seems Elon achieved his goal regarding his time management goal.

And I also remember some saying Apple engineers basically spent their time all year preparing for Jobs' next upcoming presentation. :)