The timing of the development of a mobile application directly depends on the functionality that needs to be developed, as well as the choice of platforms and technologies. For example, just an application for one platform (iOS, Android) can be made in 1-2 months, provided that you do not need to develop the server side. Some applications are developed for six months, a year. For example, complex applications with a backend, user interaction, support for an extended number of platforms (iOS, Android, tvOS, iPadOS, Android TV, and so on), and a web interface for administration.