How long does a Dolgio shampoo bar actually last? Oyumaa tested one in her own shower for 4 months, on waist-length hair. The result: about 50 washes from one concentrated, waterless bar. Rooted in Mongolian nomadic wisdom, this piece breaks down the real cost per wash, what affects a bar’s lifespan, and why using less can become a quieter, more intentional way to care.