Is it normal to spend a whole day reading and writing about a single paper for a literature review? I'm not native speaker and I'm doing a lit review at the moment. My Question is it normal to spend a whole day reading and writing about  one paper? So I read the paper deeply and then write about it. The process takes more than 6 hours.  Is that normal or should I try to double that?
Just to expand on Peter's answer, there is a saying on the University of Canberra's Academic Skills Centre: Reading and Remembering regarding academic papers:

Academic material is not meant to be read.
It is meant to be ransacked and pillaged for essential content.

Particularly, some of their advice for reading academic texts may be of help in helping you with the time taken to read and summarise the texts that you have, specifically before you start reading, have a question already that you want answered and very importantly, to optimise your time in reading academic papers:

If there is a summary, a conclusion, a set of sub-headings, or an abstract, read that first, because it will give you a map of what the text contains. You can then deal with the text structurally, looking for particular points, not just reading ‘blind’ and so easily getting lost.

I always have a subject-based dictionary on hand as well.