I think it means that people that say they work 90 hours a week have no other life obligations (or ones that they have accepted) and have internalized their com

I think it means that people that say they work 90 hours a week have no other life obligations (or ones that they have accepted) and have internalized their company's mission as their own reason for living. They may be _working_ those 90 hours but that definition is effectively meaningless because if the company mission is their mission then peering into their own navel is justifiably work. Whether that is productive or valuable for the company is unknown.