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