In my article, Two Secret Features of Quicksilver, I've discussed how to use Quicksilver to set a delay before running application.
Roughly, I believe you've already known how to create automator application to speak text which have been discussed here. In case you don't want to waste your time creating the application, I've created an application to only speak up "Time's up!" when it's launched; It can be downloaded here.
A brief information regarding to Automator on Wikipedia :
Automator is an application developed by Apple for Mac OS X that implements point-and-click (or drag-and-drop) creation of workflows for automating repetitive tasks. Automator enables the repetition of tasks.. (source : Wikipedia - Automator)
Also there is a very nice detailed information from TUAW regarding to the basic of Automator.
Simple automator applications that can be helpful for your file processing.
For these automator applications, you need to specify your files by dragging those files to the automator application icon.