It looks like two teams per ScrumMaster is a new industry standard thanks to Spotify. However, in many companies, it gets even worse. I heard about three, five and even eight (sic!) teams per ScrumMaster. So, I decided to describe in detail a typical week of a ScrumMaster to give an understanding of how much and what kind of work is done by this person.
As an input for this article, I took my calendar from different periods of my professional life, some memories, and my knowledge. Let's agree that this hypothetical ScrumMaster will work with two teams.
And last but not least, please don't treat this article as a direct instruction for a ScrumMaster. Use it instead as information and inspiration.