The true answer to this is to write as (in)frequently as you want, but in my motivation post I suggested writing little and often. I think this is really important when you first start. Like anything, writing takes practice. It takes a while to get into the right head-space and even longer until you are happy with the way you express yourself. I imagine that is even worse if you are trying to writing in a second language.
In addition to what I said in the motivation post, there are a couple of things to consider.
If you are in the mood, keep going. Some days it just really feels natural and you feel happy with the content you are producing. On those days, don’t put an artificial limit on yourself. Let it flow.
Even if you are writing regularly, don’t be too quick to hit that publish button. Dumping 20 blog posts on the world will probably result in many of them being overlooked by your “loyal” followers. Having a few “in reserve” is also a pretty good idea for those times when you really can’t be bothered. 🙂 Of course, time-critical posts like, “X has just been released and it’s [amazing|rubbish]!”, have a limited shelf life. 🙂
As an example of these two points, this series of posts was conceived and written in a single session at the computer. Rather than banging them out, I planned to sit on them for a week and re-read them a few times, then start to release them on a daily basis.
As I said in the motivation post, the world doesn’t care how often you hit the publish button. 🙂