I've been subbed since launch. I've taken small breaks here and there. Up to a month, but without my sub lapsing.

I still find things to do in game, and when I get bored or another game comes out, I play those, logging into xiv for fc stuff or dailies occasionally. I don't really have any trouble keeping myself entertained in xiv though, there's tons of stuff to do, though I don't expect everyone to be interested in things like completing the crafting log achievements. I've slowly been working towards them on all my crafters.