Do not underestimate the travel time to the airport. Even with the web checkin facility of Cebu Pacific, you still need to be at the airport 45 minutes before flight departure.
It is important to factor in the traffic and time to park a vehicle if you plan to leave one at the NAIA3 parking lot.
We left Tivoli Garden Residences in Mandaluyong at around 7:30PM, we reached NAIA3 passing thru EDSA at around 9:00PM and it took us a couple of more minutes to park.
It was too close for comfort as our flight was scheduled to depart at 10:05PM.