Sorry for the misunderstanding Tad, I have only got 5 kittyboxes so far, from 4 different Royal cats. 60 was the maximum number I might get assuming 14 days to first adult breeding and 7 day breeding cycle, up to 120 days old. I doubt i will try 60 times - by then the eye will be old news.
Since I never got any Royals myself, I ended up buying a pair on the 13th, so they were first bred on the 27th at age 14, to Ody Bellini partners.
However I forgot that the Royal princess my partner got on Aug 1 ( from one of my cats) had another offspring, but I had no Ody Bellini eye boy ready at the time.
I bred her Royal with Crystal Dream showing, to a Lucky Irish w/ Blush Quartz hiding boy, and got a Lucky Irish eye showing on the offspring. So this means the hidden Royal Sapphire eye must have passed, and is hidden in this offspring.
The offspring is still in the box, but it should have the Royal eye hiding.
So, my stats are 1/5 royal eyes so far, with the one royal eye hidden in an offspring kittybox, I assume.
Now I will have to unpack this guy - what am I going to do with a Russian Black vampire ear kitty with Royal eyes when I breed him?