The creation and deployment of the app depends upon the complexity of the app. If the application is a simple one, you can expect it to be done by 4-6 months. A complicated application can take up to 8-10 months and your prices are decided accordingly. Along with that, factors like- platform (iOS/Android), type of projects (marketplace, CRM, EHR, etc.), visual designs and maintenance services eventually decide the final time and cost of the app development.