Hmmm... 5 Mbps up & down? Still notable
HD Streaming, Torrents & Steam can achieve this easily.
I had to reduce to 250MB a day on phone because mobile data was getting expensive. If cost isn't an issue, 60GB a month is possible. 100GB if i include backups - camera roll etc.
I clocked 1.8TB in 2014 when I was creating my portable media library to use during travels. It took about a weekend to queue the first batch then was downloading ~90GB a day using IDM @32 connections via 10Mbps Zuku. I used a server to convert torrents to direct download - like @Trey does
I had remote access to the machine so would add files every 12 hours and would copy off to ensure the drive was never full. All the laptop did was download and assemble, no other service was using the connection. Best 4300 a month on net i've ever spent.
I find 1080P/4K on home consumed media to be excessive given the file sizes and the amount of time it takes to buffer/download them. A 720p BDRip Movie file takes about 30 min via Orange 3G modem and it's sufficient to watch on a 50" Bravia. 1080 & 4K start bringing issues of dedicated graphics and buffer rates which are unnecessary considering once you watch you'll either switch to something else or ultimately delete the videos.
Cartoons are even worse. 720p i get but 1080p 22 min cartoon? Some resolutions are visually unnecessary so it becomes a matter of preference not necessity. To each their own I guess.