Results seem to vary wildly depending on the methodology. Charles' article on plos.org seems to be serious, and is very complete. Still, looking at an earlier study of Penn State University published by LiveScience, they measured speeds of up to 200 miles per hour.
See it here: https://www.livescience.com/3686-gross-science-cough-sneeze.html
As mentioned in the article:
"The smaller and lighter particles are less affected by gravity and
can stay airborne almost indefinitely as they are caught up in and
dispersed by the room's airflow. [...] Some of [these particles]
rocket out at speeds greater than 200 miles per hour."
It does not go into details of how the Penn State University experiment was measured, but it clearly shows that you would have to agree on a methodology and which particles' top speed to use to get some consistent results.