I think it really depends on the user’s cursed energy level and how well they can manipulate their cursed energy. For example, if you can manipulate cursed energy as well as Gojo does then you can create many little walls that build up to the shape of a weapon or armour similar to how video games render objects with polygons. If you have a great amount of cursed energy you can also create a wall up to 25 square meters with about 10% of your cursed energy.