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Created by L on Glorious Trainwrecks, this macro causes the passage text between the «timedreplace» and «becomes» tags to be replaced with what is between those and the «endtimedreplace» tag after a certain amount of time has elapsed.
(See also: Replace Macro Set)
<<timedreplace 2s >>You see nothing. <<becomes>>After 2 seconds, you still see nothing.<<endtimedreplace>>
Additional code and documentation can be found here.