3 Alarm Questions

A few alarm-based questions. I haven't signed up for professional monitoring yet.Will the siren eventually stop on its own (like 20mins or so) or does it require someone to disarm it? I can't have my phone on while at my business & I don't have anyone that lives near me to be an emergency contact to get to my house quickly.Can I cancel emergency services by disarming the alarm if I accidentally press one of the 3 emergency buttons on the 2nd gen keypad? I love the addition of those 3 emergency service buttons, but worry about pressing them by accident.Can the motion detector be set to 'give time to disarm' like door sensors can before activating the siren?