How to slow down a typography effect in after effects?
Assuming that it is a template applied to a text layer in a comp, select the text layer and press "u" to reveal any keyframes on that layer.  Drag the keyframes out to the duration you need.  

If the comp isn't long enough, press Command K to reveal the comp settings, extend the duration.  Extend the duration of the text layer by dragging the end of it further to the right.