No. I grew up on a farm where the hens free ranged. Most laid in the hen house in 12" open topped nests but some would hide nests various places, often in a hay barn. Some of those would squeeze into spaces a lot tighter than many people would think possible. Others would lay right out in the open. People worry about size a lot more than chickens do.
My nests are 16" cubes. My stud spacing made 16" a convenient dimension and if you cut a sheet of plywood or an 8' long board into 16" dimensions it comes out even, no waste. I often see 3 hens crowded into one nest laying eggs while all other nests are empty. Each of us have different chickens and different circumstances. There is no normal.
I'd give them a minimum of 3 nests for 11 hens so 4 nests sounds good. They may only use one of them or the eggs may be scattered around. Most of my hens are OK to share a nest but occasionally I get a nest hog that not only will not share but may take a long time to lay her egg. Too many does not hurt, too few can.
Most of my broody hens are OK to have another hen lay an egg with them. But most doesn't mean all. Still, the only time I've had problems like that was when a second hen went broody a few days before the first hen was due to hatch. When the second broody heard the chicks peeping she fought the first broody to take over the nest and the eggs. They destroyed half the eggs. So now I do not allow a second broody hen to have access to another broody hen's nest.
When I was in the army many decades ago I remember using FUBAR and SNAFU much more than SOP. Since chickens don't know what is SOP, get ready for the others. It can be a wild ride but a lot of fun.