Mastersparx

@Mastersparx: And, yes it states that it takes place 100 or more years later. The fact that Aperture could not exist for 100+ years and be the same it was in Portal, just repaired like it was in the beginning, means that either GLaD0S was able to completely fix Aperture, or that only a small amount of time has passed, since Life Support was in backup mode, according to the LAB RAT comic, and Rattmann had to turn backup support on before he too, went into one of the pods. The life support would not last that long, mostly because GLaD0S hated Chell for killing her, and would have killed her before she woke up, even thought after Portal2, GLaD0S let her go because she didn't care about it that much anymore. Rattmann and Chell would be dead if it was 100+ years, backup life support was damaged, GLaD0s had the intent to kill Chell and Rattmann anyway, and its just a theory, but those kind of sound like plotholes of a sort. The creators said that is was 100+ years, yet there are signs that maybe they were wrong? (AND THE CAKE CAN BE FOUND IN THE 1ST GAME, AND 2ND, BUT IN THE SECOND IT IS THE SAME CAKE, ROTTING... CAKE DOES NOT LAST 100+ YEARS...)

STILL JUST A THEORY =P

@SerHulse: It does imply ingame that not much time has passed, due to the fact that the earth was perfectly fine where Aperture was, so the whole game might take place even before HL or HL2... I was not really sure about my theory, but I just guessed that maybe since Aperture's exit in the end of Portal2 was in a field in the sun, that the game probably ends around before or the same time of HL2, because there are still fields somewhere on Earth in HL, even though the COMBINE took over...

Portal 2 takes place a few months after Portal, so Chell could escape Aperture around ten years before HL/HL2, during HL/HL2,ten years before or a few years after BLACK MESA INCIDENT...

Half Life 2 takes place 20 years after Half Life, which takes place around 2009- 2012. Portal takes place ten years after GLaD0S kills everyone in Aperture with Neurotoxin, except Doug Rattmann and Chell, who Rattman saves (See Portal 2 Comic: Lab Rat. Portal takes place around 2009-2012 also.)In theory, Portal 2 ends anywhere between HL and HL2, or During HL or HL2. Chell could basically meet up with Gordon Freeman, Alyx Vance, Eli Vance (DEAD after HL2 E2), Isaac Kleiner, Judith Mossman, Wallace Breen (DEAD since HL2 episode 1 or 2), GMAN, Barney Calhoun, anyone in the Half Life games...