I have had one litter that started opening them at 7-9 days........... and they were jumping in and out of the nest box on their own by around 14-18 days old. Thier mother was very friendly and calm and they seemed to mature much faster then the other litters.
My other litters open thier eyes around 10-14 days.
the lady w/4 dogs, 4 city chickens, 4 meat rabbits, thier kits, and a lizard