It’s pretty common for smartphone users to quickly discard apps. From January-July 2018, Adjust analyzed 8 billion app installs worldwide and found that on average, apps get deleted in 5.8 days after they’re last used. Entertainment apps get uninstalled the quickest and, on average, lasted less than one day after last usage before they were removed.
Source : Most Apps Get Deleted Within a Week Of Last Use – eMarketer Trends, Forecasts & Statistics