Entering twice

Hi, I will be transiting through Beijing airport for 5 hours in April on my way to the Philippines, 2 weeks later on the way back I will again be transiting through Beijing only this time I would like to stay for 2 days and my question would be am I eligible for the 72 hour free transit twice or will I not need one the first time? as the first time I will not be leaving the airport at all simply connecting onto my next flight.