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[Ygdrad]

The X game series(except X: Rebirth), the X3 set of games could suck a lot of time out of you.
Borderlands 2 can also be a huge timesink if you really want to make it one.
Dungeon Defenders(I'm ashamed to say I have 300+ hours sunk into that game ><).
Inside a Star-filled Sky
Demon's Souls/Dark Souls can offer a fair bit of replayability.
Cataclysm: Dark Days Ahead

Some of these DO have a multiplayer mode, but you can totally play them in single-player, although you may lose some flavor in the case of the DSouls games.

[itisnotlogical]

The first three Elder Scrolls games: Arena, Daggerfall and Morrowind. Arena is pretty forgiving if you've played old-school RPGs before, but Daggerfall will wipe the floor with you unless you build a good character and Morrowind is just a huge world with a ton of unique content.

[WealthyRadish]

Mount and Blade: Warband's my most recent time sink. I rebought it yesterday evening, blinked, and realized it was 6:30 AM. I hadn't even started getting fiefs.

[Xantalos]

Dragon Age Origins.
I bade this fact upon the knowledge that I'm playing 6 simultaneous campaigns in the game, going across characters as a whole when I progress along the plot.

[Frumple]

... the dominion series. Well... technically, I haven't played 1 & 2, but I assume they play out mostly the same as 3 & 4. Especially, or so I hear, when you're doing a PBEM that makes it into the end game. Not only will it likely take literal months to get there, individual game turns end up taking... a while. But the payoff can get pretty epic. E: Though that's not the single player portion, obviously. SP games just take a half dozen or more hours per go, usually. And you'll be playing more than one

[Robsoie]

In the last couple of years (as if i go further the list would be too long), the titles i spent/wasted the most of my free time into :
Thief 2 : Metal Age (with fan missions)
Mount&Blade : Warband (mods or not)
ToME4
Elona
Operation Flashpoint (that mission editor is still top notch)
Orbiter

[Sonlirain]

Sim City
Just about every game from Sierra/Impressions (Cesar I-IV, Zeus, Pharaoh and god know how many other city builders)
Anno (Any game form the series)
X (entire series)

[Caz]

Alpha Centauri, Dominions 3, any of the 4X "just one more turn"-type games.

The Geneforge and Avernum series can take a massive amount of time to complete, too.

Any open-world RPG. Skyrim comes to mind.

[Yoink]

I know I sank a lot of time into Dragon's Dogma.
Constant pointless battles might be a bit of a cliche, but in this case it combines with the lack of fast travel to create an interesting experience, where a long journey really feels like... a long journey. Interesting having a game where you actually need to plan ahead for a trip.

(Also Sims 3, but that's already been said. Waaaay too many sleepless nights on that game, until my freaking game made a habit of freezing whilst saving.)

[fraxert]

Elite; I haven't really played a whole lot (yet!), but, from what I know, it takes a looong time to hit 'elite' status.

[gimlet]

The game I spent the most time on, ever, was Pacific War, the grand-daddy of War in the Pacific.   WW2 in the Pacific, each turn covered one week, so Dec 1941-1945 could be 200+ turns at 10-20+ minutes per turn, depending on how much fiddling around needed to be done.  More if you were setting up an invasion.  With all areas set to human control, and all HQ on manual control of course - the only manly way to play.   Although as I got better the games ended earlier and earlier, still it was hard to finish a game in under 60-80 hours.   And I know I played a fair number of games either to the end or 'til the other side was well crushed - it was the go-to game on my laptop when I was on long business trips.

Distant runners up Civ 2, Alpha Centauri, MOO2, X-Com, War in Russia and the various Paradox games.  Oh and Sims/Sims 2 - I know I maxed out every profession, plus a bunch of scenarios like Asylum Challenges, on top of a lot of just puttering around.

[TripJack]

roguelikes in general: hack, crawl, adom, whatever

other games really don't come close in terms of how long it will take you to get a win...

[Empty]

I've recently put a lot of hours into the xcom like ufo games.

[vaaern]

Monster hunter!

[Avis-Mergulus]

Dragon Age Origins.
I bade this fact upon the knowledge that I'm playing 6 simultaneous campaigns in the game, going across characters as a whole when I progress along the plot.

I second this notion.