Several times a year, when we don't have much work to do, my boss lets everyone go early. All the full-timers usually finish @ 4, so they would get to leave an hour or two early. This Friday is our last working day before Christmas and we are shutting up shop @ 2pm which means everyone will be finishing 2 hours early. I finish at 2.30 anyway so feel I should get to come in a bit later (by about an hour) so I get to benefit as well, after all they're being paid for the 2 hours they're not working. Or would this just be petty?