If you are starting from scratch then mobile app development will take time in the following manner:
- You will have to spend 1 to 2 weeks completing research work to back your idea
- Idea validation can take 6 to 7 days and it includes marketing strategy and business model
- You will have to spend 2 weeks documenting the technical design, estimating the cost and further duration
- You can release the app prototype in a week after this process
Or you can follow this image:
However, if you are willing to know how much time a custom mobile app takes in terms of coding then you can consume 4 to 6 months to accomplish this goal. On the contrary, businesses and development teams that are using cloud computing solutions, especially backend services like Back4App can create, run and launch an application within a few clicks only.
In this regard, you can also benefit from this
https://blog.back4app.com/how-to-build- ... sing_MBaaS step-by-step guide to deploy and run a mobile app's backend swiftly with the help of an MBaaS platform. The other platforms that you can consider in this regard could be AWS Amplify, Backendless and Firebase.