Dates of the Rigweters

The river saraspaty is mentioned as an actual river in the Rigwether. It was last in its prime around six thousand b c, and it started declining slowly because of the decline of the indian motio monsoon. So that would tell us that around two thousand b c was the late vadic period, or maybe before that. And the rigwetic period must have been maybe a thousand years, maybe two thousand years, or something like that. We don't know for sure.