This keyword evaluates to the number of milliseconds passed since the passage
was displayed. Its main purpose is to be used alongside Changer
such as (live:) or (link:).
(link:"Click")[(if: time > 5s)[...]], for instance,
can be used to determine if 5 seconds have passed since this passage was displayed,
and thus whether the player waited 5 seconds before clicking the link.
When the passage is initially being rendered,
time will be 0.
time used in (display:) macros will still produce the time of the host passage, not the
contained passage. So, you can't use it to determine how long the (display:)ed passage
has been present in the host passage.