What if the Week Was Set in Stone?

It's hard to exactly imagine what this would have been like because we think the week is just set in stone. But if you have weeks of different numbers of days and everybody's not on the same one, it can be incredibly confusing. Like imagine thinking back on TV, just like TV programs and TV schedules. And then I'm tempted to try and think of it. Well, maybe it would be like using both pounds and grams or something,. having to use two different systems of measurement.