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.