According to the FAQ: Can we please get a clarification on the cut off date/time? Is it Midnight (pst) on 3/25? Midnight (pst) on 3/26? or some other arbitrary time? Thank you.
Roshen, EQ Community Relations: "The offer of one free Heroic Character + Bundle will expire on March 26th, 2014 at 11:59PM PDT." Here is the link: http://forums.station.sony.com/eq/index.php?threads/heroic-characters-faq.208899/ (last paragraph of his post)