Hey Hamster, 99% is awesome!
Just out of curiosity, I did a few different testings online myself.
If I sprint at my absolute fastest, I can do 78-80 WPM at 95-96% accuracy and I can last only 1 minute lol. At 2 minutes, I would drop to around 92% accuracy.
With fast-typing, I vary between 68-74 WPM at 96-97% accuracy. I can last around 5 minutes at this setting. At 10 minutes, my predicted accuracy would drop to around 94-95% at similar speed.
Without pushing (how I normally type at work), I average consistently around 58 WPM at 98% accuracy, and for a much longer period of time.
On relax mode (how I normally type online), I average around 50 WPM at 98% accuracy.
http://www.typingtest.com
http://www.calculatorcat.com/typing_test/
http://www.typeonline.co.uk/typingspeed.php