If you want to go by patch 2.0-2.1 (112 days interval or 1 story year = 1 major patch), it's been 15 years. At the end of 2.0, Minfillia still referred all events of 2.0 as '5 years ago', but it was just before 7th astral era started (at patch 2.1), so we can assume a new calendar year had started.