As per a SpeedTest I have a 599Mbps download speed, 12Mbps upload speed, and Mut 21 coins 14ms of ping on Comcast XFINITY as I write this. Google recommends at 10Mbps download speed for 720p streaming, 20Mbps download speed for 1080p streaming, and at least 35Mbps download speed for 4K streaming.

As for me, I pay an excess fee to have unlimited data on my private home network. But for those with no choice, data usage is a big element for Stadia games.

Concerning information use, it will naturally vary according to your quality preferences. If you're intending to play Madden NFL 21 using Stadia Pro at 4K then you are likely looking at around 16-20GB of information usage per hour. Since this is a game you can play solo, online, or locally with friends on the exact same Stadia link (through Chromecast with multiple Stadia controls or on mobile or a PC browser with multiple controls plugged in), it's impossible to understand just how much information it will suck up since hours will vary for everyone.

I played with Madden NFL 21 on Chromecast through my 4K TV, on PC in a Microsoft Edge Browser, also on cellular with the Razer Kishi and using just touchscreen controls. Unexpectedly, Madden is actually quite playable using touchscreen controllers as soon as you get used to buy Madden 21 coins where the digital buttons are situated.