That was actually worth reading, not definitive, but at least not out of tin air.
It was and is definitive. I alluded to it my previous posts in this thread. You say you have done research on this but failed to find any of it? Your research must have began and ended at Solidnav.com
Bendytoy's literature on the Lagoon 42 has this info publically available.
As to definitiveness:
3 hours of motor at half hull speed is a fact, and as a fact that is not enough to provide a normal and necessary safety factor for any but the most short sighted fair weather sailor.
Battery driven, regenerative charged, solar charged and wind charged pure electric systems are not technically feasible or economically prudent for long range cruising as done by the majority of real people out there. Sure it's been done, by daredevil technology demostrators off on their newest publicity seeking adventures, not by your average Joe and Jane.
Sailnet is a great place to talk sailing and facts, perceptions and such are probably better at SA or latts and atts.