I forgot to mention the time card...
Yes, we all have timecards to punch in and out of work. A 15 minute break for breakfast and a 30 minute break for lunch is automatically deducted unless you state otherwise. In theory, I should in the morning, take my timecard and log into a computer system. There, I re-enter the time card values, allocate at least 5 minutes to an administration cost center, and the rest of my time to cost centers appropriate to the engineering projects I'm currently working on. The system keeps track of my time, vacation, and over (or under) time. The overtime is taken as extra vacation. 50 hours undertime gets you a bit of a frowny face and they really balk at 100 hours under (yes, it has been done). At that point you are faced with mandatory make up hours or they don't pay you, which has also been done for tax reasons.