Around 4 months, or untill they start laying eggs. Some chick feeds are meant to be switched to a "grower" feed after a certain point, check the feeding instructions on the bag to make sure what age to switch.
Aww that's great! There's nothing better than having a bunch of little chicks :love
Yeah that's probably because I started training for a missions trip around February and my life got a lot more busy But it's been good