Where is the preference for the timing on wallpaper slideshows kept?

Question

I feel like such a setting should be somewhere in the registry, but can't find anything which is obviously "time between change".

Bonus points if it's easy to change on a remote machine on the network!

Answer 1

I feel like such a setting should be somewhere in the registry

There is a registry entry which contains (but not controls) the current slideshow duration in miliseconds. It is

HKEY_CURRENT_USER\Control Panel\Personalization\Desktop Slideshow\Interval

You can change it, but the next time you use the theme, the duration will be 15 minutes again. That duration is copied from:

%USERPROFILE%\AppData\Local\Microsoft\Windows\Themes\theme_name\theme_name.theme

(a text file) where there is an item named Interval near the end of the file. You can change the value of that entry to, say:

Interval=14400000

which is 4 hours, or any other value. But I do not know where the 15 minutes duration comes initially from.

Source Windows 7/8 Wallpaper Registry Keys (Slideshow), answer by Apps

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Further Reading

• Is there a way to change the Windows 7 desktop background rotation time?