There are only two trustworthy dates in ancient history. One is the first Olympiad in -776 BC. Since the last one was held in the modern era (AD 394) it is possible to accurately place Greek and Roman history within that timeframe. Egypt’s only reliable date (from astronomical data) is the Sack of Thebes by the Assyrians in -664 BC. No event earlier can be accurately dated. But Egyptology presents its historical dating with the precision given a list of American Presidents. The chronology of Egyptian kings is primarily offered by Manetho (c.300 BC). His list of Egyptian kings (and other extremely fragmented records), form the basis for dating Egyptian history and its monuments. But they do not, and cannot, offer dates as we know them. No records from Manetho himself exist. Our understanding of his history comes from Christian historians five centuries later. J. H. Breasted (one of the giants) says Manetho’s history is “mostly imaginary.” Breasted:
Although we know that many of his divisions are arbitrary and that there was many a dynastic change where he indicates none...
his dynasties divide the kings into convenient groups which have so long been employed in modern study of Egyptian history that
it is now impossible to dispense with them.
There’s little to any of it beyond speculation. But since there is nothing else to go on it becomes the fact of the matter. Any chronology is better than no chronology.
Although we know that many of his divisions are arbitrary and that there was many a dynastic change where he indicates none...
his dynasties divide the kings into convenient groups which have so long been employed in modern study of Egyptian history that
it is now impossible to dispense with them.
There’s little to any of it beyond speculation. But since there is nothing else to go on it becomes the fact of the matter. Any chronology is better than no chronology.