Most chickens, male or female, seem to know how much calcium they need and can self-regulate if they have that option. All chickens need some calcium but the girls laying eggs need a lot more than a male or a girl not laying eggs. Occasionally you can get a chicken, male or female, that eats too much or not enough but that us unusual and may require special treatment.
If you grind up eggshell and mix it with their feed they have no ability to limit or increase calcium. You take that option away from them. You can always offer calcium on the side in case if it not enough but they can't manage intake if it is too much.
Depending on how they are managed some chickens can get a lot of calcium from their environment. If you put out oyster shell or eggshells they may not touch that source of calcium, it can last a long time. Or it may disappear fairly quickly. It depends on how much calcium they are getting elsewhere.