While a Google Algorithm Update was the only noteworthy thing going on in May 2020, this turned out to be a massive update that took about 2 weeks to roll out, starting May 4th.
Google Confirmed the Update was Happening
Google confirmed the update was rolling out in a series of tweets on May 4th. While it doesn’t happen every time, it is common for Google to confirm when an update is coming. However, the updates usually take a few days to a week. This update took 2 weeks, with Google sending another tweet confirming it was complete on May 18th.