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By default, the Oppo Smartphone's alarm clock rings for 5 minutes until it turns off automatically, and can be adjusted to ring at the following times

Android 11 | ColorOS 11.0
Step 1: Tap on  Clock
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Ring duration
Step 5: Choose an  Option
  1. Tap on Clock
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Ring duration
  5. Choose an Option
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Oppo Instructions