every sports game :)

Buy this:

http://www.bundlestars.com/all-bundles/rpg-champions-bundle/

It sounds like that's exactly what you need.

Mass effect tri? Baldurs gate?Faster than light,diablo 2-3, starcraft,dragonshard,imperium galactica 2,Neverhood. I think you nedd to search in older games...

Dark Souls 1,2 and Demons Souls

It's not an RPG, but The Binding of Isaac is a wonderful time consumer!
Also, Fallout: New Vegas. I know it looks like a FPS, but it really didn't feel like one to me.

the witcher 1

Try getting 100% items in Recettear.

5 dolla sucky sucky love you long time

Mount and Blade:Warband, Eador, Heroes of Might and Magic have RPG stats, leveling and consume too much of your precious time.

Try Path of Exile.
It's a free to play title, the last time I played, it was truly FREE (all you could buy were purely cosmetic items and a bit of extra storage capacity).

Many people said Path of Exile is "what Diablo 3 should have been". I can't judge that myself, as I haven't played D3, but PoE is definitelly a pretty decent free to play "diablo clone" with MMO elements :)

Shadow of Mordor?
Kingdoms of Amalur?
Resident Evil 6?
War of the Vikings?

Are you talking about games that you never stop playing because they don't end?

Multiplayer games, obviously. Try TF2 or L4D2 or something. Also, anything with user-generated content tends to last a long time.

(this is the part where I shill for Trackmania again.)

Two Worlds 2 was kinda fun, but I played it with another person. We had run out of co op options after borderlands, and dead island, so it was a good multi-player co-op type game. Not sure if I would have picked it up otherwise though. The biggest time sink I have played is World of warcraft... Not a nice thing to suggest but... :) a ton of time can be wasted there. but you have to pay... On Steam the GTA games have kept me busy...

Cant go wrong with Fall Out: New Vegas

Morrowind + the overhaul mod is fantastic

You can waste time on all of these great very fun good games = Heroes of Newerth, Dota 2, Battlefield Heroes, Counter Strike Nexon Zombies, Battlefield Play 4 Free, Hazard Ops, Warframe, Zombies Monsters Robots, Need for Speed World, Loadout, Command and Conquer Tiberium Alliance, Tactical Inteverntion, The Mighty Quest for Epic Loot, No More Room In Hell, CrimeCraft Gang Wars, Infinity Wars, Path of Exile, Gunz 2, Archeblade, Unturned with friends, Fistfull of Frags, Blacklight Retrubotion, Hawken, Tribes Ascend, Dark Blood Online, War. Inc. Battlezone, Dizzel, Global Agenda Free Agent, Raiderz and something more maybe. All are decently nice games, enjoy.

You find Skyrim cartoonish, bright and happy? Don't even try Oblivion, then.
Skyrim graphic resemble sad, obscure and grey land (vanilla of course)

Option 1: Get Killing Floor now, play for ages.

Option 2: Wait until Killing Floor 2 comes into early access in the next 40-50 days, play until the universe collapses.

games with long playtimes:

• xcom - enemy unknown

• starcraft 2

• hearthstone

• wow

better than games:

• https://projecteuler.net/

Starpoint Gemini 2. May be less appealing if you never played Freelancer, or played it and didn't like it.

Borderlands 2. I have 350 hours under my belt and I'm still playing. Helps if you have the GOTY edition.

Yeah but tf2 tho' Iunno, what about trying to get good at CS:GO so you can get into the comp scene? I know L4D2 is a good time-sink

Since you states you played too much Borderlands 2 it implies to me that you like loot based games, hence most of my list.
Diablo (1,2,3), Torchlight 1 & 2, Path of Exile, Borderlands Pre-Sequel, OG Borderlands, Amazing Adventures of Van Helsing and its sequel, Titan Quest, Dead Island and Riptide, and DOTA 2. I'll update this list when I get more time.

If you like Cookie Clicker I recommend Clicker Heroes.

I'be been playing "Neverwinter" for the past 40 days.
I like it!
You can spend a lot of time playing daily.
And it will take you much time to get the best gear.

I'm playing Endless Legend right now--it's akin to Civ but in a very interesting fantasy setting and way nicer looking. It also has some interesting gameplay mechanics like turned-based battles ala Expeditions: Conquistadors (also a great game). I can definitely see myself wasting major time in Endless. Maybe it's called Endless for that reason..