I rarely 'scan' for more than a minute.
I like to use dual watch to monitor a city-wide frequency that simulcasts in-progress, shots fired calls, etc., can also hear requests for police helicopter, and canine. And a Tac frequency. If I'm interested I can switch over to a district/zone, after hearing the city-wide simulcast.
Sometimes I'll keep the local district on low volume in the background.
I like to use dual watch to monitor a city-wide frequency that simulcasts in-progress, shots fired calls, etc., can also hear requests for police helicopter, and canine. And a Tac frequency. If I'm interested I can switch over to a district/zone, after hearing the city-wide simulcast.
Sometimes I'll keep the local district on low volume in the background.