I did contract work for the Post Office a few years ago and according to the Facility Directors, Tuesday is the slowest day.
That's my observation, too, from my little, rural Post Office. Saturday volumes are comparable to Wed., Thu., and Fri.. With no Saturday deliveries, Monday [already, by far, the heaviest day] will be crushing. And don't even talk about a three-day weekend.
I can't figure out why Washington thinks it's such a good idea to cut out Saturdays. The only way it could possibly work is to hold back the so-called junk mail and dribble it out during the course of the week.
Even then, though, the First Class letter volume -- which is still substantial given the reduction in the workforce -- will be impossible to deliver without substantial overtime.
Just can't figure it out.