Eve Online - 3 years

City of Heroes - 18 months (not sure exactly)

Lineage 2 - about 1 year

FFXI - 6 months (again not exactly sure)

Atlantica Online - 5 months

I know Atlantica isn't AAA but it was different enough to stay fun and interesting for longer than most AAA games.

EQ1 - 3-4 years seriously (and more off and on)
CoH - 4 years seriously (and more off and on)
WoW - 3 years seriously (and more off and on)

Vanguard: from start until now with a long pause.

EQ1 - 5 years

EQ2 - 3 years

DAOC - 1 year

Guild Wars - 2 years, played the PVE like a mmo

DDO ftp - 6 months

EQ, EQ2, CoH, GW, Aion were the longest for me.

Guild Wars - 7 years

Age of Conan - 4 years

Everquest 2 - 5 years

Lotro - 1 year

everything else no longer than 1-3 months.

Its hard to remember...  but a few that i have played for over a year.

Darkfall

SWG

EQ

EQ2

AOC

AO

cant think of any others than have lasted over a year.

Originally posted by nilden

Inspired by the couldn't uninstall fast enough thread. I bring you top 5 you played the longest!

1. EQ1                       4+ years            
2. WoW                     4+yrs
3. City of Heroes     4+yrs
4. UO                         2+yrs
5. SWG                      2+yrs

P.S. would be neat to see a tally of longest played and fasted uninstalled.

It was the first thread I ever created on MMORPG.com, so I'm happy I inspired you to create its opposite! I agree a tally would be fun/interesting with possible insights perhaps.

Here's mine (accuracy may vary, not subbed to any atm)

1. CoH 4+ years (second part on and off)

2. WoW 4 years appx (basically Vanilla from beta to launch of TBC and then on and off) 

3. The Realm!!!!!! (3 years appx)

4. UO (2 + years appx) 

5. Lotro 1year 1/2 

Played LoL since launch casually but I don't think it merits a spot as an MMO (although it is my fallback online game whenever I'm MMOLess.

I will include some that are not AAA, hope the OP forgives me

1) WoW

8 years and still active. I swear I am looking forward to leaving this game. However, it will not be for another rather shallow themepark unless it offers something revolutionary. Hoping that ArcheAge will finally make me leave :)

2) Lineage II

I played this grindfest for years. It used to be fun back then. Nowadays, it is rather inferior game in my eyes especially because of the gameplay and the inevitable grind at higher levels.

3) Knight Online

I do not know how many of you even know this game. Oldschool graphics, almost every single person on the server was Turkish, just terrible. What I loved about the game was the gameplay. As a mage, it was incredible fun to gain exp using AoE. Those who played that probably know what I am talking about.

I did play other MMOs as well, but none of them is worth mentioning.

1. Eve Online, been playing since 2004

2. Everquest, played for at least 3 years.. maybe 5..

3. World of Warcraft, probably played for at least 3 years.

4. SWG, played it from beta until the NGE hit..

5. DAoC, got into this one late unfortunately, played for just over a year.. and wished i'd started sooner

1) SWG - 3 yearss

2) LOTRO - 3 yeats

3) WOW, EQ2 & Vanguard all about 6 months each

1) WoW - 7 years

2) AC1 - 5 years

3) UO - 4 years

4) LOTRO - 5 years, but on and off (lifetime account), real total must be approx 2 to 3 years.

And that's it. EQ only lastest a couple of months max. (UO and AC1 were both MUCH better games), DAoC became boring after a few months, same for games like SW:TOR, Rift didn't even pass the first month (talk about a linear and boring world), SWG was not bad but I was busy in AC1 back then, EQ2 was sub par compared to WoW, and I've played all the other mainstream and most smaller MMOs too but none of them is memorable and latest more than a couple of months.

5) Number 5 would be Anarchy Online then - I played it for over a year back when it was released, much better game than the bad launch can make one think.

WoW: 4-5 years

DarkFall (not really AAA, but...): 2 1/2 years

GW2: Anticipating a long run.

That's about it.

1. Everquest

2. EVE

3. DAoC

4. LotRO

5. SWG

All of those make it into the 1yr+ of hardcore play, usually with multiple returns...the drop off after number 5 would be pretty steep...down to games that only got a couple of months in one shot.

Well,

1. Guild Wars (5 years)
2. Aion (3 years)
3. Age of Conan (3 years)
4. City of Heroes/Villains (2 years)
5. Second Life (but its not an mmo - 4 years)

EQ2 - 4+ years

EQ - 4 years

DAOC - 1 year

SWG - 1 year

LotRO - 1 year

1. City of Heroes
2. EverQuest
3. WoW
4. LotRO
5. EQ2 (mostly because a lot of gamers I met from UO and Shadowbane went there)

I've enjoyed other MMOs more than these, but each of these had 2+ years out of me.

Daoc 2001-2003
SWG 2003-2005 (and some revisits but that may count up to a 5 or 10 days at best)
AoC 2008-2009 (and one month here and there to test out the new content and updates)
TSW 2012-????

Beside this i have played many mmos for days, weeks, months but they had no lasting aspect to me and i only stayed to play with friends.
We tried WOW out after SWG got NGE and wandered around looking for a game as apealing as our previous experiences.
The most ideal mmorpg to me is swg with daoc pvp and the immersive storys TSW offers and its mobile combat and the "realistic" art direction.

UO -~- 3 years -~- 2001 -> 2004

Lineage2 -~- 3 years -~- 2004 -> 2007

Lotro -~- 2 years -~- 2007 -> 2008; 2011 -> 2012

WoW -~- 2 years -~- 2008 -> 2009

Darkfall -~- 2 years -~- 2009 -> 2011