Reference response times in LVP, Fire Crews are expected to attain the same standard. (CAT 9 Airfield in U.K.)
We have SMR so ATC can advise incident location with a pretty good degree of accuracy and the response vehicles are equipped with GPS in airfield map mode.
Hope that covers one query.
In terms of "being suited up" for 12 hours, I think most would be somewhat physically drained come part way through a shift. Staff also have other duties including training and maintaining their fitness.