Macintosh Laptops

How I can keep my macbook screen time watching movies?

I've read that going to save energy and adjust the battery but that does not work. I may be damaged. Now less than a minute to look at something, and obfuscation, then the screen goes black. I need to know how to keep the mail screen for a longer time. Thank you.

Knowledge Energy Go to System Preferences and drag the cursor to the screen to sleep ever. "Then go to the Desktop & Screen Saver System Preferences, and move the cursor to the screen saver to "never"

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