Karen Brothers, Professional Organizer - I recently discovered how incredibly useful the Alarms feature on my iPhone can be. I used to use it for setting a timer for an afternoon nap.
Set timer for 30 minutes 👍
6 apps to set up recurring alarms on Android and iOS | Popular Science
30 Minute Timer with Alarm | Meditation App MindTastik
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How To Set An Alarm On Android: Once or Recurring Alarms - Tech Advisor