Readymade products are the Products that are build not for any particular user but for the users in common. Since, we provide the readymade products are for common user, it is not esstiontial that all the features of such products are of use for every customers. Suppose particular feature says 'chat' may not be used if the product has limited users.
So we can say that ready made product does not require any extra time for the development since, it is pre-developed. Thus, it can be use immediately after you purchase.