There is no definite time to complete an app as it depends on the client to client and company to company. The mobile app development strategy has different stages, and all of these stages require other time slots from the planning process until the launch of the application. 

Yes! React Native can be used for both Mobile and Web; developers can write a single React Native application that can run efficiently on Android and iOS and also on a web browser using web technologies. 

Yes, you can start a completely new app and replace it in the App Store with the new one. Likewise, migrating an existing native app into a react native application. But it is essential to discuss how much importance it holds and whether it is worth it or not. 

While the list includes Facebook, Skype, Walmart, Airbnb, Uber Eats, Instagram, Wix, and Tesla are the apps created by large corporations with seemingly limitless resources, React Native is also a popular framework among small enterprises. 

QServices always provide specific guidance and assign a responsible team under project team members, and we directly provide you with day-to-day reports with screenshots. 

As we know that React Native is basically based upon JavaScript Framework. Their code is written in JavaScript. Also, JavaScript enables such a framework to iterate at next-level speed and create higher performance.