A small timer app on a RPi controlled by Nuimo:

Commands: Swipe up - Start timer Swipe down - Stop timer Press Button - Display time left Rotate right - Increase time Rotate left - Decrease time On Time expire - send SMS or play a sound On Rotate - Display timer

Time increments in minutes.  Minute range from 1 to 60.  After 60 go up in 30 minute intervals up to 12 hours.