The sensors are notoriously unreliable. How long to wait to dump depends on your tank size and usage, but you should have a fair bit of time yet. Your right, there are hundreds of threads/ opinions on when/ how to dump. RV toilets don't use a lot of water, guessing less than a 1/2 gals per flush, if you have a 40 gal tank, that's 80 flushes.
I keep an eye down hole, and dump when convient so I do not have any too full events at night or first thing in the am. If you have the opportunity, at least one time, use your black tank until it is quite obvious that it is full, will help you guage it for the future.
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Brent W
2019 Duramax dually
2015 Fuzion 325
2008 Goldwing
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