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How to Change How Often a Mac Screen Saver Changes

Part 1 of 4:

Confirming your Settings in Terminal

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    Open Terminal. You can type "Terminal" into Spotlight search to access the program.
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    Verify your current settings. The default length of time is 3 seconds.
    1. Copy and paste the following into the Terminal window: 
      sudo /usr/libexec/PlistBuddy -c "print ':JustASlide:mainDuration'" /System/Library/PrivateFrameworks/Slideshows.framework/Versions/A/Resources/Content/EffectDescriptions.plist
    2. Press ↵ Enter.
    3. If prompted for your password, type it in and press ↵ Enter. The keystrokes will not appear as you type it in.
    4. Unless you have changed this setting before, a number 3 will appear, confirming that the default setting is in place.
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    Click the Apple logo at the top left of your screen.
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    Click Restart.
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    Press and hold ⌘ Command+R immediately after restarting. Doing so will cause your Mac to boot in recovery.
Part 2 of 4:

Disabling System Integrity Protection (SIP)

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    Click Utilities. Once on the recovery screen, you can open Terminal and disable SIP.
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    Click Terminal.
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    Type in csrutil disable.
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    Press ↵ Enter.
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    Click on the Apple logo. It's at the top left of the menu bar.
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    Click Restart.
Part 3 of 4:

Changing the Screensaver Time Length

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    Open Terminal. You can type "Terminal" into Spotlight search to access the program.
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    Copy and paste the following code into the window: 
    sudo /usr/libexec/PlistBuddy -c "set ':JustASlide:mainDuration' 10" /System/Library/PrivateFrameworks/Slideshows.framework/Versions/A/Resources/Content/EffectDescriptions.plist
    1. You can replace the "10" in the code with any number of seconds you wish.
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    Press ↵ Enter.
    1. If prompted for your password, type it in and press ↵ Enter. The keystrokes will not appear as you type it in.
  4. How to Change How Often a Mac Screen Saver Changes Picture 15
    Type in the first code to confirm your changes.
    1. Type in: 
      sudo /usr/libexec/PlistBuddy -c "print ':JustASlide:mainDuration'" /System/Library/PrivateFrameworks/Slideshows.framework/Versions/A/Resources/Content/EffectDescriptions.plist
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    Press ↵ Enter.
    1. The number displayed should be the one you entered earlier.
Part 4 of 4:

Re-enabling System Integrity Protection (SIP)

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    Click the Apple logo at the top left of your screen.
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    Click Restart.
  3. How to Change How Often a Mac Screen Saver Changes Picture 19
    Press and hold ⌘ Command + R immediately after restarting. Doing so will cause your Mac to boot in recovery.
  4. How to Change How Often a Mac Screen Saver Changes Picture 20
    Click Utilities. Once on the recovery screen, you can open Terminal and disable SIP.
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    Click Terminal.
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    Type in csrutil enable.
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    Press ↵ Enter.
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    Click on the Apple logo. It's at the top left of the menu bar.
  9. How to Change How Often a Mac Screen Saver Changes Picture 25
    Click Restart. SIP will be re-enabled, and your screen saver adjustments will be made!
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