Fact: Friday (the weekday) is 100% Friday (the measurement). After Friday has passed, the pendulum swings swiftly back: Saturday is 2/3 Friday, and Sunday is 1/3 Friday.
Sometime during the week we start moving towards Friday again. Tuesday is 1/4 Friday. Wednesday is 1/2 Friday (humpday, yay!), Thursday is 3/4 Friday. Friday, of course, is the only day that is a full 1 Friday.
Monday is 0 Friday. It's, like, Anti-Friday (the weekday, not the measurement).
-- CC0 Björn Wärmedal