I ran some tests a few months back on how much bandwidth I use up while watching Twitch. What I found is that if I streamed Twitch 24/7 that I'd hit something like 1.2 TB down in a month.
By that logic, even just 3 hours a day would be 150 GB down a month.
By that logic, even just 3 hours a day would be 150 GB down a month.