hi Scotty, my Corolla 2006 automatic says I don't need to change the transmission fluid unless in…

hi Scotty,
my Corolla 2006 automatic says I don't need to change the transmission fluid unless in extreme driving conditions. I got it used so I don't have the car's history, also my area is a bit dusty. so how should I know if I have to change it or not? what defines extreme driving conditions?

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