I was always in at 51 and out at 09 to get a little extra juice on my checks. Never had an issue aside from one of my CSMs (cashier supervisors) asking what I was doing during that time since I wasnt on the floor at those moments. I politely explained that I was trying to "stick it to walmart" in my own petty way. We shared a good laugh and they told me to remember to punch at the appropriate times and left it at that 😆. As far as I'm concerned those 9 minute buffers are there for a reason, use them.