Daily. I used to skip Saturdays, but since I discovered DE, it is just too much fun, so no skipping.
I love the 4-pass "luxury" shave. I did this on Saturday and spend a good while practicing technique. It felt amazing. Sadly I had to do a quick pass today, so only 2 passes6 days a week. I skip Saturdays. Sunday is my leisurely, luxury 4 pass shave and feels great getting rid of two days of stubble.