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To learn more about the timescale of the outflows of OH/IR stars, we study the spectral band of crystalline olivine at 69 {\\mu}m. The 69 {\\mu}m band is of interest because its width and peak wavelength position are sensitive to the grain temperature and to the exact composition of the crystalline olivine. With Herschel/PACS, we observed the 69 {\\mu}m band in the outflow of 14 OH/IR stars. 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