Base
The output appears here. (hopefully...)
The app takes the number of hours per day spent on your favourite app, and renders how many days you will spend in your lifetime on this app. Assume an average life expectancy of 82 years.
On Android 10, iOS 12, and later versions, we can see how many hours per day we spend on each app. Find the number of hours you spend per day on the app you use most. If you're not able to find this, you can google for common statistics.
For example, if I spend 2 hours per day on WhatsApp and I live an average lifetime, how many days will I spend in my lifetime on WhatsApp?