72 hr free visa to beijing

My flight from California will arrive in Beijing on sept 11 at 1130 pm(almost midnight). my next flight to Manila is on sept 15 at 0100 am. Can I hang around the customs area on arrival until I get transit permit by 0100 am (exactly 72 hrs) . I also planned to go back to the airport at around 1000 pm on sept. 14 to catch my flight for 0100. I hope this is not a problem.Thanks