Henry, as we’re already a year in and they’re not there yet, I’m thinking at least 2 years total. But maybe 3. This is not unheard of; my F1 Onxy Perc offspring have been shown to still be evolving their color pattern at three years of age. IF you look at the pattern progression, you can see without a doubt it is continuing to evolve, but on a month-to-month basis it is admittedly hard to see. (https://lightning-maroon-clownfish.com/?p=2018)