Hi Sir: If an old sensor, calibration is performed automatically in the background if the sensor is exposed to clean and polluted air for approximately 30 minutes each. If a new sensor in LP mode and there is a good variatioin in concentration, it take more than 8 hours to get the valid IAQ value. And if you want to compare between two sensors IAQ in the same background , it take more than 7 days for them to reach datasheet specification parameter setting 15+15%. More information is presented in confidential documents, I don't share to you directly, maybe you need contact local FAE to get it under NDA.
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