Everyone I've ever known has loved working 4 10's and honestly 4 8's would be even better. They never complain about burnout and a 3-day weekend every week leaves them energized and recharged for the next weeks' work. I only ever hear complaints from people working 4 12's which at that point you'd hear the usual complaints of anyone working 8 hours of overtime a week.

The fact I've never once heard a complaint about 4 10's from anyone I've ever known to work them says a lot compared to the usual 5 8's which I hear complaints from about everyone (including myself).

n = 19~21 people or so