Hey neighbors! To your point, @CrazyCat, that is indeed true. This is why some neighbors will tend to lower their entry delay. Please note that most contact sensors and motion detectors are set to be secondary doors, windows, or rooms, which means that those sensors, when tripped, will set off the alarm automatically with no delay. In addition, you can have Confirmation Calls set up through the app under the main menu > Settings > Monitoring Professional > and then toggling on Confirmation Call. This is more of a peace of mind feature to ensure that in the events of false alarms that you are still getting a call from our Central Monitoring Station no matter the event, especially if you still feel the need to have authorities dispatched.
Please note that regardless of the entry delay, the alarm still has to be disarmed at some point. So, even if a neighbor has a 30 seconds or 2 minute entry delay, after that set time, the Ring Alarm Base Station is sent a signal to “alarm.” If the unit is destroyed, it will not actually siren, but the system in the back-end will state that it is “alarming.” Then entails the string of events of 30 seconds of the Base Station “alarming” before getting the call from our Central Monitoring Station. The system will not be stuck in the entry delay if it’s destroyed, so you can rest easy knowing that, @Falcon! 
Hope this helps clear it up and give you that added peace of mind.