I haven't found a full list of range activities, but there's a key comment in [this article][1]:  

> The Air Force currently requires several days to reconfigure its ranges between Atlas, Delta and Falcon missions. That turnaround time should be reduced with the introduction of auto-destruct mechanisms

So in the old situation, every user had its own self-destruct system that needed some unique equipment or configuration on the ground (because the system expects information in a unique format, for example). Because the self-destruct system is, well, destructive, they'd want to test the system after every reconfiguration to make sure it works and that no false destruct orders will be sent. That alone could take a few days. 

They'd also need to provide the Range Safety Officer (the person with the finger on the 'Destroy' button) with all the information they need for the decision, again unique information for every launch vehicle. 

By replacing the self-destruct with a standardized system, the need for reconfiguration is no longer there. 

  [1]: http://21space.info/auto-destruct-system-seen-as-a-key-to-ramping-up-launch-tempos/