The longest game you've beaten start-to-finish in one sitting.

[SimuLord]

About to fire up New Vegas in an effort to go from Doc Mitchell's house in Goodsprings to sending Lanius packing with a speech check at Hoover Dam/Legate's Camp in one long, glorious end-of-winter-break run. Previous playthroughs have averaged about 40-50 hours each, but since I know the game like the back of my hand now (after nearly 200 hours of total play) and no longer have to go on long exploratory trips to know where I'm going and what I plan to do, I don't think it's too much of a stretch to think I can cut it down to 30-35. If the latter, I would break my previous record, standing since 1998, of 33 straight hours (a Final Fantasy VII run from the Midgar train station to Sephiroth's inglorious demise at the hands of the Knights of the Round, and yes, I managed to shoehorn the Chocobo sidequest into that fast a playthrough---it was probably by then my 14th or 15th time through the game---this New Vegas run is, if I'm keeping score at home, my fourth.)

For Discussion: All there in the topic title. Something short like Portal? Something absurd like getting a World of Warcraft character to max level from level 1?

 

[Count Igor]

None.
The best I have is completing both MW1 and WaW in 4 days. I feel so small!
And hey, good luck with it!

Edit: Wait. No. Scratch that. I DID do Portal in one sitting!
YES! I'm contributing!

EditEdit: And Mirror's Edge.
Suddenly I don't feel so insignificant (Even though they're both pretty short)

 

[Radeonx]

Every year my friends and myself do straight playthroughs of different Zelda/Mario games start to finish.
That's the only one sitting thing, and they normally aren't that long.

 

[lacktheknack]

Mirror's Edge... But I finished it TWICE in one sitting!

 

[Wapox]

WWE's SmackDown VS. RAW 2011 from 0%-100% over a weekend with no sleep

 

[Sixcess]

Resident Evil 3 on the PS1. It was my second run through. I don't remember how long it took, a few hours probably, but I do remember that I didn't save once.

 

[AlternatePFG]

-snip-

That sounds like a great idea, I should try that.

Anyway, I beat Portal in one sitting. Not much of an accomplishment, but eh. Oh yeah, and I beat in ME2 pretty damn quickly, I think it was over the course of 2 days, and stayed up till 3 finishing it. Don't regret a thing.

 

[Monkfish Acc.]

I kicked Mass Effect's ASS in one sitting. All the side missions included.
I, uh. I was having a problem with sleeping. As I often do.

 

[GBlair88]

Halo 3:ODST.

 

[RatRace123]

I played and beat Psychonauts in one sitting, got 100%, took about 10 hours, that's also about the same amount of time it took me to beat Heavy Rain, that too was completed in one sitting, and I beat God of War 1 in about 7 hours.

Those are the only games I remember doing a "one sitting" run in.

Oh and Sly Cooper 1, finished that within 6 hours.

OK that's it.

 

[Mr. GameBrain]

I've tried a couple of times to one-run Megaman 2.
But since I suck, I never normally get past Wily.

 

[The Lost Big Boss]

Halo Reach, Heroic

 

[Dizzle26]

Resident Evil 5. Stayed up all night with a homie and had a blast. Haven't touched it since.

 

[hermes]

Many NES games didn't have password or save options, so... many games that I beat at the time (like Castlevania, Megaman 1, Ninja Gaiden 3 and The Flinstones) had to be beaten in one sitting...

 

[oplinger]

I beat RE4 in one sitting when I got it. Took 14 hours. I never took a break ...I didn't even pee.

It was amazing.

 

[MiracleOfSound]

The day I bought this...

I had never played HL2, its episdoes or Portal and, well.... I did them all in one glorious marathon session that was one of the best 24-26 hours of my life.

 

[Hashime]

Mass effect 2 with 100% of the universe explored, no DLC as there was none at the time.

 

[Tharwen]

Portal.

I don't really have much else to say here, so I'll leave you with a random video:

Spoiler

 

[Reed Spacer]

I play RPGs. If I can finish an RPG in one sitting, I wasted my money.