Joseph………………
I honestly don’t know, but Yekkes did business in the German Gentile world and certainly would have had to conform to their time habits.
Non-Hareidi Jews attended German Gymnasiums (e.g. Einstein) and would have always been seated in class before Herr Doktorr Professor entered.
My niece’s German Jewish family settled in St’ Louis about 130 years ago. WQhen she married my nephew the wedding was held in the Missouri Club with a brought in Kosher caterer. Her parents, grand parents and great grandparents had all been members along with the major German Gentile families such as Busch from Budweiser Breweries. The German community in St. Louis to this day is totally mixed Jewish and Gentile and functions in harmony.
Her family is full of judges and many politicians from both the Missouri side and Illinois side of the Mississippi River were invited. The Illinois Governor was late, but the affair was not delayed one minute for his arrival. The German-American merchants and politicians were all seated promptly before the stated time on the invitations.
As I’ve posted before, my German side arrived in NY in 1868, there was no one left to ask what was learned in Germany, the last known relation on that side left in 1880.
My Litvak side arrived at Castle Garden, NY in 1872, by 1890 all relatives had either arrived in NY or were living in Manchester, England. B”H no known relative was affected by the Shoah.