4x10 hour work weeks are nice. I had negotiated for that at one location I worked at. I had Wednesday off. This had me working only 2 days in a row and with that Wednesday off I could get errands done that are normally difficult on weekends.
That said I do not think they should only have to work 32 hours for 40 hours of pay. Maybe that is their way of asking for too much and allowing the company to feel like they negotiated a little.