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We usually go 4, maybe 5, days before it is necessary to dump the grey or galley tanks. Longer for the black tank. If we know we are going to dump the black tank soon, we will dump only part of the grey and/or galley tanks, then use it a couple of days later to help rinse out the sewer hose after dumping out the black tank.
A good way to help with the unreliable grey/galley tanks indications is to install a gate type valve at the dump outlet. Simple job, and there are a couple of threads in the Forum regarding how to do this. One advantage is that you can "interconnect" the grey and galley tanks by closing the gate valve and opening both galley and grey water tank valves. Also gives you about 3 gal more "waste water" storage. Finally, no more unpleasant liquid surprises when you take the cap off to install the sewer dump hose.
Best,
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