Five minutes... just enough time to get my robots in position to detonate the entire planet's nuclear arsenal... mwahahahahhahahahahahaha!
EDIT: Oh I suppose I would have to say something like....
"Oh world, those of you who speak english anyway and can understand me... Oh planet full of insects and bacteria fighting for your place on the organism that is Earth. I'm talking about you viral beings called humans... All of you, with your incessant chatter, arguments over who's right, who gets what rights, who sits where on what bus, where your lunch is taken, what time it actually is, who's God is correct, if there even is a God, who's math is perfect. I advise you to take the next 2 minutes after this speech to truly think about what you've done with your life and if you've truly wasted it or not. Because after I'm done speaking..."
*Play a few minutes of nuclear explosions going off because by then my robots have done their work...*
"Goodbye"