Why does my truck shut off after idling for two hours? Can this be adjusted or turned off?

What is your question?

I don't think there's anything wrong with it. It just turns off by itself after two hours exactly. And I can turn it back on immediately. I use my truck for work, which sometimes means sitting in it idling for hours. So at night when it shuts off and all the lights come on it is annoying. I assume it's some kind of safety feature or gas saver. But I'd like to know if it can be turned off or adjusted for different links of time for when it shuts off.