How long does the Dexcom G6 sensor last? June 12, 2019 09:25 The G6 sensor lasts 10 days. Related articles How long does the Dexcom G6 transmitter last? Can the Dexcom G6 be used underwater? Does the sensor have to be calibrated? How do the Dexcom G6 sensor and transmitter work? What is Dexcom G6?