Set the fade duration (the time it takes from the line starts to fade till it's hidden) of lines added to a ScrollingMessageFrame.

ScrollingMessageFrame:SetFadeDuration(seconds);

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Arguments

(Number seconds)

seconds 

The duration of the fade in seconds.

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Returns

nil

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Example

DEFAULT_CHAT_FRAME:SetFadeDuration(15);

Result

Changes the fade duration for lines added or updated to 15 seconds (very slow fade).

DetailsEdit

SetFadeDuration(seconds) doesn't affect already visible lines, unless these are updated.

A way to update them is to call one of the Scroll methods.

The default fade duration seems to be 3 seconds.

See also ScrollingMessageFrame:SetFading([isEnabled]) and ScrollingMessageFrame:SetTimeVisible(seconds).