Need a fairly simple app to be developed

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Need a fairly simple app to be developed
Hello, I see that you do mobile app development for iOS/Android Operating systems. I was wondering what your estimated time to complete an app with these main functionalities:
Take a video (Max 30 Seconds)
Video has a filter on it with text
Ability to share the the app to twitter/facebook/instagram (Here I also want a predetermined text to be typed on twitter that also links to the application on app stores)
Possibly have in-app purchases (Not confirmed yet)
The app would overall have 4 pages in total:
Page 1: Home page explaining what the app does
Page 2: Where you take the video and share the video to social media
Page 3: Settings Page (Links to privacy policy, links to company website)
Page 4: If there is a page 4, it would be for in app purchases
Skills:
Mobile App Development
, React Native
, Flutter

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