According to my Wakatime profile I coded 19 hours last week, an average of 3.5 hours a day.
This,however, doesn't mean I worked only 3.5 hours every day. I'm no plain coder (and I don't think such a role exists, although it might in the future), but a software engineer. Whenever I plan to write a piece of code, I tend to think a lot beforehand, or even consult with my colleagues on how it will scale. For example, a few days ago we had an intense chat over e-mail about a new feature I want to roll out soon. It turned out I overlooked some parts of it.
So in that 3.5 hours I write actual code. But it's really hard to quantity how much I think before that.