Re-reading the series in August 2017! The last time I read HP was 2013; I've read it all 4-5 times (6??) at least since I first picked it up in 2008. I've lost count, but now that Goodreads keeps track of re-reads I'll have a better idea. 
 I do know the date my 2013 re-read started, because apparently I instagrammed it! Ha! I knew social media was good for something.