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There is a Tumblr post going around that states it has been one length of Homestuck since Homestuck ended as of today.
There should be a bot-run page on Cohost that knows the air dates of many popular web comics and TV shows and will post to announce when it has been a full rerun of time since the show ended. For a stretch goal, whenever original publish/air dates for individual strips/episodes are known, it could report the time in Rerun X, Season Y, Episode Z format.
It would post on major comic/show start and end anniversaries and also give the current time in rXsYeZ format for a handful of other shows it knows about.