I think it depends upon a lot of things. First, have you established a good reputation (good service and quality babies)? If you do, your babies will sell quicker. Do you have popular morphs? If you do, your babies will sell quicker. Do you vend expos? If you do, you will have better sales. Do you know other breeders and check on their stock. This can give you a way to introduce new morphs by trading what you have for their babies. Some of my babies hang around for awhile, some have deposits down on them before they even come out of the egg.