Hour requirments depend who you fly for...
I had about 250 to 300 hours when I did my first Pacific flight from Oakland to Honolulu Via Maui ( Fuelstop ). This was a supervised flight where I had a more experienced pilot with me. next was a supervised Solo where I flew an airplane on my own and a friend of mine who had done about a 400 crossings flew in another.
Third I was on my own and flew a Archer to Honolulu. Next was a Twin Otter I was again in the copilot seat. Then I moved into the Twins and flew a couple of Navajos and Chieftains around pacific. Then a Twin Otter as Capt with a CoHo that was learning the biz.
A couple of Metros and Kingairs accross both Atlantic and Pacific. A few Cherokee VI singles... Some hours in a DC9 and Citations. About 70 crossings and 600 hours later it was time to find a job that would not be so seasonal and dependent in the US Dollar exchange rate. Longest flight ever: PHNL-KOAK 18hrs 06 min.
I still accept ferryflights every now and then as it is quite exciting.. but I choose my planes carefully. It helps a lot to be approved by Lloyds approved for this type of work if you are thinking about it.
JJ