When should I change my transmission fluid?

When should I change my transmission fluid? - 1
Added (1). I have a 2013 Honda civic Lx and some people say I should change it at 80,000 miles and some every 30k. I currently have 27k miles driven. I was reading the owners manual and it only specifies what type of transmission fluid I need to use and how much should be put in.
Added (2). BTW my car is an automatic transmission 1.8L engine.

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