Liquid dish soap is mostly water in a plastic bottle. These bars are the concentrate without either: wet a brush, swirl it on the bar, and the lather cuts grease the same way. The set pairs a bar with a ceramic ramekin to keep it draining between uses; refills keep it going after that.
Months, for most kitchens — it's concentrated, so there's no water padding it out. Keep it in a draining dish so it dries between uses and it lasts considerably longer.
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