How Long will alarm go off?

Hi all

Moved my keypad to my house alarm earlier-

Alarm keypad : eurosec pr5208

unfortunately ive lost the resistor between the two 12v connections so the alarm is going off and theres no way i can reset it as the keypad now doesn't work.

Ive read modern alarms should turn off after 20 / 30 minutes, which would be great but after a few hours will it go off again ?

I'm hoping it turns off after the 20 min timer and stays off until i get a new resistor

Any help and advice is much appreciated !

Thank your for your time

Jack