If line - drying your clothes isn't possible, using wool dryer balls will speed up drying times, by 25 % or more, depending on the size of the load and how many dryer balls you use. (thinking-about-cloth-diapers.com)
I also decreased the size of each load that I was washing which meant they were taking up space in the washing machine for half of the week. (clothdiapergeek.com)
Take the amount you would use on a load of clothing the size of your load of diapers, and use a tiny bit less. (abbyslane.com)