[notabothonest]

It depends. It was not something that happened at a fixed rate. There were periods steady rise between 1 and 2.5m per century... but then you had events like the sudden flooding of the Black Sea area from the Med, or the Tsunami which finished off Doggerland - https://en.wikipedia.org/wiki/Doggerland#Disappearance - both of these events would have had human victims, and survivors, and must have been absolutely terrifying.