I bought a coop for my chickens that said it was for 3 to 4 chickens but only comes with enough room to have two nesting boxes so I was wondering if they all will lay their eggs at the same time.
No, most chickens don't lay like clockwork. And if more than two need to lay at the same time, they will find a spot either on top of another chicken or in a random place...some chickens may not like the nesting boxes, it's a personal preference...but really, two is probably enough.