Check this article (http://www.sciencemag.org/news/2018/09/some-scientists-publish-more-70-papers-year-here-s-how-and-why-they-do-it). With more than 70 paper a year, it is apparently possible to have a paper every week (5 days even).

I think it happens for two reasons. First, most of the scientists or academics are very productive and submit multiple papers at one time to different journals. Based on the time of acceptance, copy editing, early view and then actual print publication, they can end up with more than two or three papers a month. The second reason, which could be somewhat controversial, is that the scientists not only write their own papers, but they also get authorship for the papers that are written by their students, sometimes post doctoral fellows, and perhaps junior faculty. Some of these scientists could be legit contributors while authors could get ghost authorship.

Mahmoud Ahmed and Ahtisham Younas thanks a lot for your replies. Yes, I checked some authors and actually authoring is more important than quality of the science. I think the system of graduating and rewarding in publications led to this situation. I think also that the quality of sciences is decreasing. A lot of publications means also less quality. Big scientist in old time could not more than one paper per year !

Best regards

I agree Samia CHEHBI GAMOURA. However, it is also the case that some scientists are involved in big consortia which generate a large number of papers in short periods. So I think it is not always a bad sign to publish frequently, not each five days though :)

Mahmoud Ahmed Yes I totally agree.

Thanks a lot for your interest and interactive comments.

Best regards