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If the gauge is not working correctly open the toilet cover and shine a light in the tank. Another option is to use a stick to measure from the bottom of of the tank. If the tank is full or nearly full it should still be below the the bottom of the toilet. If you overfill your gray tank(s) they will start backing up in the shower. You don't want to overfill your black tank for obvious reasons.
Three to four days to 2/3 full would be standard for two people. I always run extra water in mine to facilitate emptying and typically go three days easily.
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