The duration of the snooze feature can be set as desired in the clock app of the OnePlus smartphone.

We can set a minimum of 1 to a maximum of 30 minutes.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Clock app
Step 2:  Open the  Settings
Step 3:  Tap on  Snooze lenght
Step 4:  Set the  Snooze lenght
Step 5:  Confirm with  OK
  1. Open the Clock app
  2. Open the Settings
  3. Tap on Snooze lenght
  4. Set the Snooze lenght
  5. Confirm with OK

OnePlus Instructions