Is the Android on your wireless network or cellular network?
Bandwidth is dependent on the format of the video. SD, ED, HD, UHD, etc all have a different bitrate. 1 hour at each bitrate would consume different amounts of your data cap.
You're trying to make it sound implausible to consume 42 GB of data in 1 day by listing high numbers of time-consuming sources with low bitrates. Of course you can't consume 80 hours of SD in 1 day. That'd be like me trying to fill my gas tank with a 1-ounce measuring scoop in 1 day with 3,584 scoops! However, I'm sure I could consume 80 GB in 1 hour.