Several issues here:
1. You're not supposed to brush more than 5 minutes at a time 2-3 times a day
I wouldn't be surprised if you're tearing the shit out of your gums right now
2. It takes time to whiten
You're not going to whiten your teeth in one day's brushing, I would think you're smart enough to figure that out.
3. There's bleaching and several other things you could do to speed that along
Though I myself would just stick to brushing and mouthwashing, flossing is a waste of time in my opinion
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Five minutes, at least 2 times a day plus mouthwashing every few days, floss if you want. After about 2-3 months of a regular regimen and that should help. You should also get a good brand of Toothpaste that helps to fight tartar, whiten, strengthen enamel, and fight gum disease.