A research group has released its report on app use and purchasing for the first quarter of 2020 (1Q2020). It has concluded that the average amount of time spent on them per week increased by 20% year-on-year (YoY). In addition, app revenues increased 5% on both the App Store and Play Store.
https://www.notebookcheck.net/A-new-report-details-the-time-and-money-spent-on-apps-in-2020-so-far.459983.0.html