In total I'd say its about 12 hours a day. It really depends. I have been in every day for the past two weeks, but starting next week I will be out for three solid weeks. I have gone long stretches being in and out. Since we've been a public company, being out has increased.
Turnover is usually a sign that something is wrong.
We have had very little, fortunately. When companies aren't doing well in this industry you tend to hear about it pretty quickly and usually see the turnover happening. A lot of times it depends on the individual's options. There are a lot of opportunities out there now. The last I heard there was nearly 100,000 jobs available at Silicon Valley startups.