Generally, the news date we give for dates prior to July 2020 is one day after the date FactSet gives for the earnings report, though there are a few exceptions. If FactSet doesn’t give us a date for the earnings report (which isn’t very often), we use a complex checklist to determine a reasonable news date for PIT data.
In July 2020, when we switched from Compustat to FactSet, we started keeping track of when FactSet actually gave us the data, and we use those dates.
I’ve been observing this ever since we switched from Compustat to FactSet, though not systematically. With small caps it’s usually less than 24 hours. With microcaps and Canadian F shares FactSet can take a little longer than 24 hours, but I have rarely seen FactSet take more than 48 hours. I’m not sure, but overseas F shares may take longer than that.
In general, FactSet is much faster than Compustat, who on occasion will take three weeks to process an earnings report.