You can set a trigger based on a time interval or based on the completion of another task.
So, for your scenario, whenever the task that rebuilds the qvf completes, you can trigger another task.
First create 2 reload tasks,
Reload Task 1 - reloads your initial qvf.
Reload Task 2 - reloads your dependent qvf
Add a trigger to Reload Task 1:
Create a new event task event trigger:
This will create a linked task. When your qvf reload job (Reload Task 1) completes successfully it will automatically start the reload of the dependent task (Reload Task 2).
Hope this helps.