What is the actual maximum duration in seconds for a custom sound played when a notification arrives in Android?
In iOS the limit is officially at 30 s for custom sounds.
Do not use a sound file longer than about 20 seconds. If you use short noises as your ringer, the audio will be repeated many times.
To enable repeat alerts on the Android mobile app:Tap Notification Settings. Tap Repeating Alerts. Tap the toggle to enable the feature. Tap Repeat to set the number of times the notification will be repeated after the original alert occurs (one, two, three, five, or ten times).
Your phone or tablet may make sudden notification sounds if you have unread or snoozed notifications. You may also be receiving unwanted notifications or repeating notifications, such as emergency alerts or a noisy app.
Nice to meet you here, Beat! I'm not sure that you still need the answer, but anyways:
I wasn't able to find any limit in Android documentation and decided to make a test. So I set Beethoven's 5th Symphony (36:20) as a notification sound and started a notification. It played the full time. So I assume, that Android has no notification sound limit.
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