You could increase your throughput with multiple monitors to simultaneously view multiple episodes. A bit of gaze detection and audio could switch to whichever feed your eyes focused on.
I watch most videos on 1.5 - 1.8, and sometimes even run some parallel. That's pretty normal these days with all that low quality-content around. But even then, watching 200h in a week is pretty awful. And for high quality content I usually take a bit more time, after all it's worth it.