Test this new version on your devices: countdownUpTimeFormat2.apk (3.5 MB)
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How many time formats can be displayed at the same time without problems (depending on the processor performance of the device)?
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How many formats also run in the background, i.e. if the app is not visible (after pressing device Home button) or the device is in sleep mode (screen off)?
On older (underperforming) devices, there might be problems if many time formats are displayed at the same time.
Note: To display the times in the correct format, calculations with long numbers (Java: long) are carried out every millisecond, so that the processor performance may be overwhelmed.
So please test and give feedback …
Here is a test of one of my test devices (Galaxy Note8, Android 9):