I am looking for any indication of how long should it take to write, let's say, a paragraph, for a non-native English speaker (with a good knowledge of English). I know that for the writing process of a paper or essay one should take in account also the time required for research and mind-mapping, which is not easily quantifiable. I am interested in some reference for the time needed to translate the mind map to a paragraph. The only time indication I found was in http://www.scripps.edu/milligan/em-journal/pdf/Scientific_Writing.pdf (e.g Introduction: 3 days) , but the author clarifies that it is a personal opinion, and anyway it includes the mindmapping procedure. I can spend half an hour writing and editing a couple of sentences (already knowing which concept I need to express), how can I know if this time it's abnormous?
(meta: Feel free to move to personalproductivity if it's the case, I was unsure but then I thought of posting in academia because I am specifically talking about scientific writing)