Glad you're enjoying it!
I have a lot of plans for the game, and wouldn't like to put a timescale on completion, but we are most likely talking years. I have plans to produce not only the main storyline but also a large number of side quests and other stuff to find in the game world. The scope is pretty big, and I'm only one person, so there's enough ideas and plotlines to keep me going for quite a while yet.