the farthest I've gotten with a tribe is about 800 days or so!
By the way, I've tested with some genes before, and for the paw genes, the gene that the mother passes on is always in the top slot. So if you have a double clawed male and a double nimble fingered female and breed them, the children will always have nimble fingers in the first slot. (Fun fact: Violet and Yellow eyes work like this-- they are on the same dominance level, so if the child gets both of those colors, then whichever color the mother passed on is dominant! I don't know yet if any other genes do this, though)