Hi! My three girls are now 10 weeks old and still in the house (). They do free range all day though. (I love them in the house but they are just getting to big to be in the box that they are in. Always jumping or stepping on each other!!) When I first got grit I just mixed it into their food, before I read to give it to them free choice. I made a little box to put their grit in now. I have put in about a tablespoon or more of grit in it. They eat all of it within a day. Is that normal because it seems like a lot to me!? Thanks so much!