Former journalist here. I worked at a business dot-com where the writers were expected to churn out at least 5 market briefs a day, and the majority of them did more. I also worked at a daily newspaper where it wasn't uncommon for me to write 8-10 news briefs a day, but they were largely just rehashing police reports or otherwise summarizing content that was already in front of me (as opposed to doing boots-on-the-ground reporting).