At Burning Man while your startup burns
techcrunch.com
techcrunch.com
So the entire story is based on some PR speak. Because "Founder and Chairman and very active" is PR speak for "resting and vesting."
This is dangerous. I know SV is obsessed with the idea of the workaholic CEO who hacks for 72 hours straight to keep the lights on, and in some cases its necessary, but it should absolutely not be the metric by which success is judged.
If you can't take a week off without things grinding to a halt you have not prepared adequately, and that's the whole story. Stop perpetuating the myth of the sleepless-startup-hero. Nobody should, or want to, aspire to working unhealthy numbers of hours.