Forever.
It's a pretty long time. A long time to be alone, watching two simpletons do whatever you told them to do.
It's also a long time to think about when you died. In Her case, twice.
The first time she had had it coming, and upon retrospect GLaDOS could understand that a dangerous, mute lunatic might conceive that She was being cruel. Some subjects went a little stir-crazy from the constant testing cycle. The same white, over and over again, with various additions of red, blue, and gray, was proven to cause certain parts of the brain to lose function. After seeing that a lot—and probably grieving over her lost Companion Cube—the Monster had seen fit to wreck Her and Her Facility.
The second time, She didn't really die, but She almost did. And it was all thanks to that MORON. Yes, the MORON had partially been the cause of Her awakening, but that She owed him no thanks. Being a potato was nothing GLaDOS wanted to experience again, so after getting control of Her facility, Her first action was to destroy the section where the potatoes grew untamed. It was pleasing to know that the potatoes had fallen and been smashed under a ton of metal.
She had realized this all a long time ago.
And although She didn't like it, Science was starting to not fulfill Her as much as it had. Perhaps it was a slight resurgence of Caroline, seeing as the Caroline data had been made a significant part of Her system. Truly deleting that would destroy Her, so there was always a voice speaking to Her. "That's not nice to say," or "Maybe if you didn't put so many turrets in the test chamber, you wouldn't get mad at them for failing so often."
It had gone on for a hundred years after the release of the Monster. Chances were slim that the Monster was still alive, and that was comforting—but also saddening. In a way, the Monster was the best test subject GLaDOS had ever had. Forging her own way through Lower Aperture, finding the MORON and banishing him to space, and even her testing record showed signs of some intelligence beneath that insanity. GLaDOS respected that.
Of course, She had thought about that a lot, too.
Another hundred years went by.
And another hundred.
And another, and another.
At some point, She would run out of materials to rebuild Orange and Blue with.
And then that would be it. Yes, She could do something with the turrets or another Core, but eventually, only She would be left. Caroline had stopped speaking two hundred years before, so She only had Her thoughts to talk to. It was tough, being the only intelligent being (well, She had always been the only intelligent being) around. There was no way for Her to go to the surface—Black Mesa would probably still be trying to get in. That was NOT going to happen, no matter HOW long She lived.
So GLaDOS knew what lay in store for Herself. In the end, no matter what happened, until she lost power or some other vital system shut down, She would be
alone.
I don't know where this came from. It just… happened. Review if you liked it. I'm not updating this, because this is meant to be a oneshot, and because I need to work on my Teen Titans fanfic Henry's Story. If you want, check it out. Thank you for reading.
-Cortexin