cops already knowing the ARs locations by pressing F11 and look at where the criminals going and where the place that has like 3-4 criminals wanted and go there immediately to crack the shit out of the AR as shown here basically they cracked it when only 20 secs passed so either someone leaking the AR locations or you know it by looking at F11. makes the timer bigger won't solve anything.
Wise words has been put by @Farhan-Khan .In my opinion asking for a delay dispatch call would had fixed the issue there is no point of having anti rush in ARs . For a crim it takes 3 minutes to rob and u want anti rush to be there for 3 minutes so u basically want all crims who attend to easily rob the ar successfully and do just a bit of damage to cops to get full payment and run away ,then its very tough for cops to kill criminals in just 2 minutes btw if we dont receive dispatch call we cant enter we die instantly and on top of that you trying to put anti rush its Negative in my opinion .