Slow Speed
Although a lot of posts say it takes three days, I do not think that is correct. I have a synch speed of 1760, which should give me 1.5Mb. (I live 5.7KM from exchange). However I have been on constant 1 meg however many times I retrain, which is what my ISP told me
I left my router on continously, and lo and behold, as soon as it clock over 240 hours (10 days) at the same stable speed of 1760, my download speed has immediately increased to 1.5Mb, which is the best I can get.
So I think 240 hours without retraining should do it.