MacBook Pro Auto Brightness, When Does It Detect and Frequency

I have auto brightness enabled.  I frequently manually adjust brightness when watching videos, etc.  I was wondering when does the MacBook Pro auto adjust brightness and/or how often does it auto adjust the brightness?
Thanks in advance.

Hello, Auto brighness is a great feature on a macbook pro and I use it all the time! Your mac has a build in light sensor so if the light is above a certain level the brighness will go up. You can also enable the automatic keyboard brightness! Just one tip, if you need your battery to last longer on a daily basis, i would NOT enable any of these.
Flynn!

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