6-9 hours. It depends. I need to be well slept to be productive. It's not the number of hours but the feeling that matters. I have taken naps at the office when

6-9 hours. It depends. I need to be well slept to be productive. It's not the number of hours but the feeling that matters. I have taken naps at the office when I had a bad night to bump my productivity. If I don't, I'm just warming up a seat. Thankfully I have lot's of flexibility regarding working hours. That helps a lot. I don't think I could work fixed hours for long.