Why is my Steam download taking so long?

Hey! So here's the thing, just last night I bought a game, Civilization V. It downloaded in 2 hours and I usually have up to 60kbps download speed witch I know isn't very good. Civilization didn't work so I got Warhammer40k Dawn of War II. It has a smaller update, about 1000mb smaller. Now it says that I have to wait 22 hours for my game to download. I don't mind waiting its just that I'm wondering why its so slow, and if it will speed up overnight? Thank's for reading!