My home's current data network consumption rate is about 20GB per day. This is about half the 1.2 TB cap that comcast has on the line. It's a reasonable number, if we streamed more shows everyday, or produced lots of video content to upload or stream we'd probably get closer to the limit.
The 1080 recording setup that I have ends up using about 2GB of disk space per hour of recording. So, in terms of producing new content I'd have the bandwidth to do about 100 hours? That's including backing up the project files. Not bad!