Mine last at least 4 weeks... but that is one shower or bath per day. My DH will only use liquid soap... someday I will try that. I keep wishing it would get used up sooner.... so I can go onto the next 'flavor'. I limit myself to two scents in the tub, there is only so much room for all those bars in there without having them stand in water. Now the bars we use as hand soap in the bath and kitchen seem to go on for months and those my DH will use. My guest BR (not used often) I have had a bar in there for almost 9 months!

My mother even complained that they last tooo long! But she gets a bar from each batch I make... so has alot of soap. And yes I add salt to each batch I make .... just because ???