We have a family of 6, and go about 3 days before we are forced to dump.
Check the position of the sensors, as they may be too low. Does the front gauge show black tank full ?
2022 London Aire 4551 * 2022 GD Imagine 2800BH * 2021 RAM 3500 DRW * 2020 Wrangler
NHSO (Newmar Hoot, Sevierville Original)