I do not think there are any real tips. People write in different ways. Some create outlines, do a rough handwritten draft and the type and will go over it a half dozen times.
I get an idea and i start typing. If I come to a point where I need more information, I look it up and then start typing again. I have never spent more than two hours writing a hub.
The hubs I write are based on personal experiences, things I learned as a reporter and PR person and things that interest me. A lot of my hubs are written as a column would be written therefore it allows me a little more freedom.
Each person has to find his own pace. As you do that, your speed will probably increase.