28x
That's 28 Royals that I have screenshots for (since 2010) but I started playing in 2007 and likely have a couple more that I don't have proof of & haven't kept track of. (on older laptop computer).
I think the longest I've gone without hitting a Royal is ~6mos. (this year) but then hit 2 in 1 week!
My straight flushes are off the charts! (I'm getting close to hitting a milestone & will post once completed)