I have heard if you put a dry towel in the dryer it will cut the drying time. I also read this hint.
I personally like to hang clothing outside, and in the winter, I do as much as possible. However, I do use the dryer for socks, underwear and towels. Of course, you can reduce the amount of drying time by keeping the filter clean, but I keep two thirsty beach towels in my dryer.
It redistributes the wetness for quicker time. I can typically cut drying time 40- 50% by using the towels. Do it at home or the laundromat, and remind college students!