You could sit down and get a royal with your first ever-in-your-life hand. Or you could play and play and play and never get one.
Most people play VP at more than one casino, different machines, so why would "every xx,xxx hands" matter as far as the odds of getting one being touted as a skill set? My first one was at Circus Circus in Tunica. Same trip I got two royals at Treasure Bay (Tunica), two different days, two different machines.
I've lost count how many royals I've had, like 30 or more. I've gotten royals after holding just one card. No skill there. I think the least royals for me have come from holding 4 to the royal. I have NEVER gotten a royal on a re-draw, out of a gazillion re-draws.
Not much skill really, and no units of play will put anybody in line, i.e. "due" for one. Just hope and luck.
As always, JMHO.
Candy