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Windows XP Tips, Illustrations and registry edits
Use any of the following methods to to change Windows Fax and Picture Viewer Slideshow Timing.
Using Tweak UI PowerToy
(Note that the the value is in milli-seconds)
Using a direct registry edit
HKEY_CURRENT_USER \ Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ ShellImageView
For example 3000 implies 3 seconds timeout, and so forth.