Hi, first of all i'd like to introduce myself. I'm an engineer from Spain who has made app development his way of living. I'm new at freelancer (i've just finished my third project with great results) but i've been developing native applications for iOS and Android for the past 6 years.
During this period, i have to implement several apps with similar features and functionalities to the ones you described, so achieving this won't be hard. I currently have two opened projects, but they are finished (just waiting for the employers to free the milestone payment and close the project).
About time/cost estimation. The cost of iOS and Android apps will be covered by the bid. This price also covers the correction of small fixes and issues until the apps are stable and work as you wish. About updates, price will be negotiated in function of the features and functionalities you want to add. About time estimation, i can make both applications in a pair of days if you have any kind of desing / imagery. If you haven't the development could take up to two days more.
If you have any doubts please let me know. Best wishes, Luciano.