If I can keep the soap dry between uses, it lasts worlds longer.
As it's a farmhouse and we have to wash our hands frequently, i sometimes need to keep a few soap on the go at one time. At the end of the day, put the soggy soap to dry, then put a dry soap next to the sink for tomorrow.
I also find a lot of people now don't know how to use bar soap. They get confused and ask where the soap is, or will take the bar soap and scrub it under the running water, instead of getting some soap on their hands, turn off tap, put the soap down, and then wash their hands, then turn on tap to rinse hands.
It ends up having liquid hand soap next to the sink for guests, cuts down on the rate the bar soap gets used up.