Microsoft has heard the cries of their customers and extended the Xbox 360 warranty to three years. With this, the repair times have also been extended. Many are sending in their Xbox 360s for repairs and have realized that waiting times have grew. Instead of the two weeks that many have been accustomed to, repairs are now taking as long as six weeks.
Of course we can always say that since there are more repairs, there are longer waiting times. But why are there more repairs? The warranty has been extended, not the hardware, features, options, etc.