Steam shows peak speed, not average. Actual speed is lower, due to disk write limits, decompression, and CPU load. Ignore the number, and trust the time estimate instead.

Another option would be the difference between megabits and amegabytes. 70 megabits /8 = 8.75 megabytes.

121GB ~ 121,000MB (I'm rounding down)

121,000 / 8.75 = 13,828 seconds / 60 = 230 minutes / 60 = 3.84 hours

Fuzzy math aside the time is close enough that it starts to make sense. If your download speed is being displayed in megabits and you're not aware of that, then yeah calculations would appear way off, by a factor of 8ish.

I can't wrap my head around the idea that 3 hours is too much time to download 121 GB of data. It's like the Jetsons, where they put the food pill in the microwave, and it's done in a fraction of a second, but they still say, "This thing takes forever."

Originally posted by Haruspex:

I can't wrap my head around the idea that 3 hours is too much time to download 121 GB of data. It's like the Jetsons, where they put the food pill in the microwave, and it's done in a fraction of a second, but they still say, "This thing takes forever."

Well yeah, I remember 768k dsl and 56k dialup. Everything is fast enough today where I don't even worry about it. I've got bandwidth to download any game on Steam in minutes or hours, while watching Netflix and doing whatever.

56k dialup it took me a month to manually download 1GB snes games one at a time.

768k dsl took me four or five days to download 30GB of simpsons episdoes.

Although to be fair to the OP if you think you're downloading at 70MB a second, then 121GB ought to take ~28 minutes. So three hours is quite a bit longer, relatively speaking.