So even with my 500 Mbps Fiber connection, that's a 40 minute download - assuming a perfect download speed. However, it really comes down to what steam can handle.
If I get even half of that I will be lucky.
Still, better than 18 hours.
I think the most relevant aspect here is whether Steam will have any preload window, which Larian said they didn't know. If the game gets even just a 2 day preload window then it doesn't matter whether you download it in an hour or 20 hours, you'll still be able to play on the first second at the time of unlock. If no preloads, then it can become annoying to have slower download speeds.
