The period between the arrival of the Indo-Aryan in the Indian subcontinent and the composition of the oldest Vedic hymns must have been much longer than was previously thought.
Notes from Wikiquote
quoted in Levitt, S. H. (2012). Vedic-ancient Mesopotamian interconnections and the dating of the Indian tradition. Annals of the Bhandarkar Oriental Research Institute, 93, 137-192.