@brxxn It really depends on how much you play. During my experience with Project Stream (basically the beta/testing phase for Stadia), I was averaging around 9-15 GB per hour, and that was with 1080 60fps (targeted, never reached that). It will be even more with 4k.
Good thing is that you can actually limit your data usage from the app settings.
P.S. I'm on the same boat btw... with Xfinity Comcast I get 1 TB per month.. let's see how it goes lol.
@brxxn Will do. Although mostly what I can give you is just an estimate. It doesn't look like there's a way to monitor the exact usage straight from Stadia itself.
It depends on how many hours you use stadia per month and if you are game streaming in 4K or just HD. I saw an article once that it will only take 60-65 hours of stadia use in 4K definition to reach the 1TB of data used.