Too many, lol. We added more space (roost and poop board) under the fan as you can see in the picture below.

The chickens roost on the two 16 feet boards on both sides and in the back. So we have about 80 feet of roosting space for 60+ birds.
I'm in the process of culling the older birds and the few that constantly want to go broody.
We have 28 nests and they only use the top 7 on both sides. Had we known we would have just built single rows of nest boxes under
the poop boards on both sides the length of the coop.
The chickens roost on the two 16 feet boards on both sides and in the back. So we have about 80 feet of roosting space for 60+ birds.
I'm in the process of culling the older birds and the few that constantly want to go broody.
We have 28 nests and they only use the top 7 on both sides. Had we known we would have just built single rows of nest boxes under
the poop boards on both sides the length of the coop.