How long does calibration take? ATI Marketing 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? 4B and 4B Lite Generator Runtime Where do I ship my unit? End of Life Announcement - 2HA, 2HA-N End of Life Announcement – DOP Oil Comments 0 comments Please sign in to leave a comment.