I try to get on once, maybe twice a week for 3 hours a day.
This is a far cry from 2006 - 2015 when it was daily 5-6 hours a day.
My reasoning is that, while it is still fun, the grind to get items (and store them) is too great. While the quests are really good (Ludendorf, Myth Drannor, etc.), new content only goes so far when you have zero, or near-zero, chance of getting new items.
Also, asking repeatedly for the devs to make toggles to let us experience the game how we want and better our experience goes unnoticed (looking at Dragonlord ground effects, unnecessary overhead pop-ups, etc).
The lack of teleporters in wilderness areas is another cause for concern. This has been asked for ad nauseum.
Their failure to listen to the playerbase is another major factor in my lessened playing time.