Time taken to write an original & good quality 500-word article

How much time should it ideally take to write an original and (at least) a good quality 500-word article?
Newbies would obviously require more time than established writers. Also, for topics that interest you or with which you are well-versed, it can be done fast. But I would like to know if an average/common time frame can be considered for everyone (taking into account all factors as typing speed, time spent in proof-reading, checking for grammar and spelling mistakes,…
Time taken to write an original & good quality 500-word article

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