You are joking, but the French revolutionaries really tried to introduce 10 hour days (with a different value of "hour" obviously) broken into 100 minutes each (again not our minute) along with their new calendar.
They did that to break the control of the church, to do away with sundays. I've run into a couple people who still support the concept. I know one ardent atheist who doesn't like that we name days after Norse gods. Similarly, when I lived in the middle east some chuckled at the concept of an Islamic nation using pagan names on calenders. They don't want a 10-hour day, but both want to break from the old dogma.
The first and foremost reason was doing away with old arbitrary customs associated with the monarchy and replacing them with standards grounded into more universal, less arbitrary references.
That's the only reason I support it, for my part, and I doubt anyone in France cares now about having weekdays named after Roman gods. Even at the time of the Revolution I believe these names would actually have been somewhat appealing, as classical culture was seen then as a model with which to replace the despised monarchy and religious oppression.