Dig this kiddies, where I work I have co-workers that often arrive 20-30 minutes early every day. Now your first thought for them is bravo for being early and ready to work at shift start time but let's look at this phenomenon on a much larger scale. If our test subject, lets call her Tina Timely, arrives 20 minutes early to work  every day, and there are 5 days in a standard work week. In one week that person spent 1 hour just sitting and waiting to clock in. 4 hours in a month.  After 6 months this person has spent 24 hours, an entire day of their life just sitting the break room waiting to clock in. And of course in a year it goes to just over 2 days of their life. A lot can be done in two days, and even if you would have spent that 2 days doing nothing watching TV, isn't  that at least preferable to spending 2 days a year sitting in a break room waiting for the clock to hit shift start? From age twenty to fifty if you follow this practice you will have spent around 2 months of your life just waiting to clock in. 

Ever notice that when two people approach a double door from opposite sides (think circle k). That the other person forgets how to use double doors and waits for you to exit first instead of just using the available 2nd door. People are dumb and love to waste time.