In the summer we probably do a load somewhere between every week and every two weeks, depending on when the washer gets full..
Right now in the winter, I end up doing laundry about every other day to every three days, I just sweat to much while wearing my layers into work, and I have to wear basically all of them (3 underlayer wool pants, outer wind shell, 2~4 chest layers of varying thickness, all wool, outer shell). When the temps are more manageable (30~55) I can wear less then all of my underlayers at once, and can usually spread out my washings across the week.
Anyone have any recommendations for really nice thick/warm wool underlayer pants that I could use instead of 2~3 layers of really thin base layer stacked? I always go with wool since I'm really prone to sweating, even if I'm 'under-dressed' in the number of layers I'm wearing!