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### 8.7 Countdown timer

Calling `org-timer-set-timer` from an Org-mode buffer runs a countdown timer. Use <;> from agenda buffers, <C-c C-x ;> everwhere else.

`org-timer-set-timer` prompts the user for a duration and displays a countdown timer in the modeline. `org-timer-default-timer` sets the default countdown value. Giving a prefix numeric argument overrides this default value.