Covid-19: Opportunities to Improve Federal Response and Recovery Efforts
GAO-20-625: Published: Jun 25, 2020. The Abstract, Highlights and Full report all available on the website.[ Not sure how many pages the full report is.]

The GAO also mentioned this report on its WatchBlog and asked for comments.

Update on June 26: GAO Staffer testimony about the report.

The Diva thought that the GAO was unusually direct and blunt in its criticisms in this report.