It's not 100% undisputed but most historians would agree that until conquered by the Persians in 525 BC, Egyptian history consists of 26 dynastic changes and 8 major distinct periods. Each dynasty of course usually had more than one ruler. Since we're talking about Socrates, then the slightly extended timeline of 33 dynastic changes (including 2 Persian, and 2 Greek), across 9 major and distinct periods, would represent pretty much the mainstream view that is supported by the available evidence, ending in its incorporation into the Roman Republic in 30 BC.

If anything, Egypt is one hell of a counter example of institutional stability. I would also make the pedantic quibble that the HRE never called itself "Germany" until the term was incorporated into part of its much longer official title in the late 1400s. English usage started in the 1500s. It's not to say that the concept of "Germany" or "Deutschland" didn't exist, but pre-Westphalia it's difficult to make truly apt comparisons to conceptualizations of states today, and the term equivalent to Germany was used, intermittently at that, from Charlemagne's death for the next 700 years somewhat like the status of Scotland or Wales within the UK today, as in, it coexisted with the HRE as an part but not considered to have referred to the whole until the HRE lost its non-German territories an that was pretty much all that was left.