64
The number of days per week is a prime number...
(reddthat.com)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
There are now at least a dozen calendar reformists edging on posting a rant about this lol.
Worth noting though that this has mostly stuck around because any attempt to switch to a more divisible week structure is met with resistance from Christians and Jews since going off 7s messes with their calendars.
Of course you could use just two liminal days inserted outside of the standard month or week and basically have a calendar where holidays stop jumping dates.