I’m not a serving firefighter.
However I can answer a few.
You’ll be deploying every 18 months for 4-6 months as an SAC.
The amount of time you get to do AT is dependent on the manning of your unit.
The majority of your day you’ll be there to respond to any emergency state on the airfield - this will mean quite of lot time waiting around on duty though most sections have a gym, will conduct fire training, do other fire related duties or work on their secondary duties.
Depending on the unit will depend what hours you’ll work and the size of the crew you’ll be on.