Service life for well service pump packing varies from hours to weeks depending on fluid abrasiveness, pressure level, pumping speed, and packing quality. Fracturing operations pumping proppant-laden fluids may require packing replacement every 8 to 24 hours, while cementing or clean fluid pumping may achieve hundreds of hours between packing changes. https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/