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Change the Default Frame Duration
You can change the default timing for new frames added to an animation. By default, frames are set to show for half a second.
Go to the Edit menu and choose Preferences.
You will see the Preferences dialog.
Click Animation Options
in the preferences list.
Enter a new duration in the Default Frame Duration field.
Click the OK
New frames you add to the animation will have the new duration setting.
New animations will also use this setting.