Hello,
which version are you using?
There are two places where you can set this up. The run option in the managed softwary delivery policy
Advanced Options - Run - User run conditions
OR
Settings - all settings - Software - Managed Delivery Settings - Run - User run conditions (which sets the default values for new Managed Software Delivery).
Users should not be able to delay Managed Delivery Polices longer that it is configured here.
I hope this helps.