Same for me - with the wall charger, always about 2 hours from about 25% to 100%.
As you know, from another thread, I also have trouble with the battery in my Touch. I wonder if this might be caused by the more rapid charging using the wall charger. In other words, I wonder if I used the computer to charge from 25% to 100% if the battery might be better behaved. I have never tried it; guess I should, huh!