add new notification that switches to the *chronos* buffer...

[super-tomcat]

Adding this as a notification that switches Emacs to the chronos buffer can help you not miss it, especially if having to leave the computer for a time....

(defun chronos-switch-buffer-notify (c)
"Switch to the chronos buffer when timer expires"
(switch-to-buffer "chronos"))

Tested and works :)