Hi AndyOhler,
You can get official BME688 product information from https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme688-ds000.pdf For lifetime, we usually perform accelerated storage & stress tests according to JEDEC standards. A usual assumption is for instance is that if accelerated stress tests like HTOL and THB are passed over 1000 hours, that this corresponds to the load of 10 years in the field.
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