Flightaware says it was 428 miles.
https://flightaware.com/live/flight/N727RP/history/20180805/1723Z/KCCR/KSNA
It’s interesting that a 757 was right in front of him. They are notorious for their wake turbulence.
It landed at 12:28
https://flightaware.com/live/flight/DAL1918/history/20180805/1501Z/KATL/KSNA
Yeah, but you fly into 22L as GA at SNA.
At a fuel burn rate of 34 GPH, a two hour trip with a one hour reserve would be 612 pounds of avgas. The useful load on the 414 is 2,200 pounds. Full fuel load is 1278 pounds, and the full fuel useful load is 929 pounds.
If the PIC had 2 hours plus one reserve, he could have carried 1,588 pounds of pax, and cargo.
The fuel burn rate is 17 GPH per engine, at 75% cruise. 75% would probably be achieved at about 8,000 MSL provided the engines are not turbocharged. I think RAM can provide that service for a quadrillion bucks.
Something else is amiss, or the PIC was a dumbass.