The app usage for a given day is reflected within 24 to 48 hours, and usage data for the new apps can take up to three to five days to reflect in the charts. It shows you the count of unique active users who used your app in a given day in UTC. It shows the count of unique active users who used your app within that rolling 30 days window in UTC. For more information, see Teams apps usage report. Usage analytics for all the apps published to the Microsoft Teams Store is available in Partner Center.
Usage analytics are currently available for new custom apps published to your org through Developer Portal for Teams or imported into Developer Portal for Teams after April 2022.