Lasted for roughly 20 hours? Sounds about right. It went from being fun to being a grind fest relatively fast, at which point I had to keep coming up with excuses to keep playing, which was the grind for various weapons that I wanted. I got said weapons and then built them up over time. Now I'm being told those weapons will be rendered obsolete and that everything I did was ultimately pointless and I have nothing to show for it now.