You cannot get it on the day - only renewals can get same day service. The only advantage of turning up at 0830 is that your paperwork can be copied there and then (apart from logbook) and if there is any issues you will be told immediately. The logbook will be returned by courier service (if you want to pay for it) along with your licence. I was advised in late June that they would turn my application round in ten working days. It was more like twenty but until the licence arrived I still flew solo locally with my instructor's permission.