Off hand I would 'guess' at twice a month. I would be way more inclined to invest in a best quality macerator/pump and tie into their system. From Google: "a macerator takes the waste from a WC, a wash basin and a shower then pumps it through 1 inch small-bore pipework, vertically up to 16 feet or horizontally up to 325 feet or a lesser combination of both."
Many better grade RV's come equipped with macerator pumps that may be used if necessary.
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Jim and DW 50 years Brenda
2018 40rssa and 2021 Jayco Eagle 40'
2019 F450, ruby red
Harley Road King & sidecar
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