if the Romans took a large chunk of territory from the Germans/Slavs/Arabs/Berbers (or any other
group which didn't have a particularly developed culture at the time), and used the various romanising
tools they had (settler coloniae, co-opting native elites, recruitment to auxilae), how much time would
pass until that province could be considered 'roman' (I.E stable, majority of latin-speakers and a base
of citizens)? was there any way to speed up this process?
on the other hand, what would be needed to romanise a 'civilized' place like Greece, Mesopotamia or any of the Persian plateau? would this romanisation result in a synthesis of cultures or a complete replacement?