How many pilots EWR-HNL and HNL-EWR requires

That is about a 10 hour flight. The airline probably has a relief crew for that flight, so four pilots.

Being as though that flight is a long haul, there would most likley be 4 pilots on board. 2 of which carry out the takeoff and first 30 minutes of the flight as well as the last 30 minutes and the landing, and the other two (usually less experienced) sit through the approximate 9 hours in between the takeoff and landing with the autopilot on, just to keep an eye on things. They are known as the `relief crew`. Hope this helped!