I've always found it humorous that the clock hits 6:00 rather than 5:00. "Leaving work on time is an act of courage, but let's not get crazy!" Presumably he courageously started at 10:00 or took an hour away from work for lunch.
In the U.S., while I think it's true that people tend to work closer to 50 hours, we pay lip service to the "40 hour work week".