How long does calibration take? Andrew Wert April 24, 2018 18:45 Updated Follow Calibration takes 7-10 business days from the date we receive your unit. Related articles How much does calibration cost? How can I check the status of my order? Where do I ship my unit? Changing Liquid Aerosol Reagent HEPA Vacuum, NPFU & PHEAF Testing Comments 0 comments Please sign in to leave a comment.