I have no idea. I used to have a 24-hour 20 GB cap which I rarely hit, and now there's no cap. Before the 20 GB cap, it was 5 GB per 24 hours, which I did struggle a bit with, but it's been long since that and I have no idea how much my consumption has changed since. On average, maybe a bit more, perhaps 7 GB? That'd be about 210 GB per month, depending on how much I download games and how much I watch videos online. It could probably vary by at least dozends of gigabytes per month between months, although it's probably generally closer to the lower end.
I'm just glad to live in a country where I think no major ISP is capping internet usage. I think they tried caps for 3G/4G connections, but I haven't seen the caps there recently, so I think they scrapped that and we're safe for now. The only reason I had a cap in the first place was because my internet connection is included in my rent and used to come through a, umm, 'special' ISP. It changed to a regular commercial ISP and now there's no cap.
