I wish it only took me that long. The amount of time I spent to 1cc UFO Lunatic, I don't even view it as having been worth it for me. So much time I spent to 1cc a game that I really should have quit playing a lot earlier. It wasn't even really about getting the skill needed for me since I didn't think it was that much harder than Hard. But the game just kept screwing me every time pretty much. I pretty much had a plan set up for it, but it just never worked out till that one run. I pretty much only 1cc'd it to try to prove a point, but I should have just left it alone. As I've said elsewhere, I'll never try to 1cc a game I absolutely hate ever again, it's just not worth it.
But 16 hours isn't much time at all, and if it had taken me that long, I probably would have viewed it as not a waste of my time. I still would have hated the game though.
Enough ranting though, Congrats on beating the hardest game in the series that's not a Phantasmagoria game. Surely the experience with UFOwill maybe help with other games if you plan to do harder stuff in them.