According to zap2it, Adult Swim is taking back the 8pm hour starting Monday. Cartoon Network has been doing this quite a bit for a few years now (Besides late 2014 I think). I remember in November 2013 for a month (when Cartoon Network still had the 8pm hour), Cartoon Network would have an extra hour at 9pm with Regular Show at 9pm and Adventure Time at 9:30pm (I think the block was called "Gift Time"). Then in December 2015 CN took the 8pm hour again with brand new Adventure Time and…