[BigDaddy]

If I held the z key down (zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz...) how long would it take me to fill a non-compressed GB text file?

I did 210 z's in 10 seconds. Each is one 2 bytes. It would take 551 days, give or take of holding the z key down with an object to fill this file. So, you'll hit the limit in 750 days or more, and your file will be 500,000 or 1 billion+ (possibly much more) characters long. Even then, it's likely the computer would just store the file on a swap on the hard drive as virtual memory... It is unlikely that other arrays in the program could handle all this information.