Culture also plays a big part. For instance, in many Hong Kong companies (where I live) people tend to stay until after their manager leaves. If the boss burns

Culture also plays a big part. For instance, in many Hong Kong companies (where I live) people tend to stay until after their manager leaves. If the boss burns the midnight oil, so do the subordinates. If your boss emails you on Sunday while you are you are playing with your kids, you answer.