In Abe Lincoln's time they used to shut down DC in the summer lest all the people die of disease.
Wow, I can't believe you justifying 4 weeks vacation from the 1860's
Anywhere I have worked in the private sector, I had to work at least 15 years to qualify for 3 weeks vacation
Federal employees (in DC) used to get nearly half the year off. Through the years that's been whittled down to the present system. At the same time they were working 6 day weeks many years after that practice was no longer customary ANYWHERE in America.