72 Hours

Everything takes 72. That's all I have been hearing for the last few weeks. For some reason computers run on a 72 hour update schedule. I needed a new insurance card. That took 72 hours to update. I need to change my prescription number. That took 72 hours to update. Who decided that 72 is the magical number? Why can't it be the moment you hit the "save" button. Why can't it be the next day? Why do things take three days to fix?