This has been nagging at me for quite some time now, and with the latest patch, (trying to keep it spoiler free) we have an instance of a character mentioning 6 years.

Herein lies the problem, since we know that 1.x was officially stated to have taken place over one year's time, at least from the world's point of view, then we also have the calamity that took us away for a period of 5 years (for us legacies), which then brings us to the events of ARR and then (after a period of two weeks between 2.55 and 3.0, I believe it was stated) wherein HW starts.

The events this character mentions, for all of non-legacies, we get it, it doesn't effect them, but for the people who /have/ been around since the beginning, like myself, this further brings this whole thing into question, not only for the purpose of why it would effect us in the first place, but when it would've taken place and where we are now.