In a previous occupation I've worked long hours, 7 days a week, sometimes for long periods at a time; but now Sundays are 'sacred'.
I'll work - quite happily - for a couple of hours on a Saturday morning, collecting and giving quotes (I save them up for Saturday mornings), but never on a Sunday.
It's now Monday morning, and I've got to be at my first account for 8.00 am; and I'm really looking forward to getting stuck into todays work.
I think you need one day per week, at least, to re-charge your batteries.