How many years were you set back when the Romans were destroyed?

Answer 1

The advances of Roman civilization, such as paved roads, arches, bureaucratic government organizations, etc., were not lost to the human race when Rome fell to the barbarian invasions. Human history continued to progress. The progress of human history is not a single straight line, it is complex. There is no way of telling, had the Roman Empire not fallen and if, perhaps, even in the year 2010 it still existed and ruled the world, we would have a more advanced civilization than what we actually wound up with following the fall of Rome. The world might be better off, or it might be worse off, or it might just be different in ways that are neither better nor worse. We have no way of knowing.