Cinegy Type does not have a variable related to duration. To achieve your goal, you can use Loop parameters in Cinegy Titler to organize work with graphic.
For example, set Start and End frame of the loop and create variable for "Leave Loop Trigger" - so you could leave the loop at a desired time. 

Please read more here: https://open.cinegy.com/products/air/11/type/user-manual/getting-started/globals/#titler-loop