I'm looking for an alarm clock app for my father. Currently he's using his cell phone (an old Kyocera flip) to wake up every 2-2.5 hours over night. I'm hoping that there's an easier way to do this for him, i.e. set the alarm once and it will automatically set additional ones at the 2hr interval. Although he's got the flip phone now, my mom's old iPhone 5c is at his disposal, as are several other androids (4.0 and up.).

Does this even exist?