We can do 4/5 days on a cassette. I never use our toilet to pee in, instead I have a hospital pee bottle & empty when half full into trees/hedges/drains etc. More than halves the liquid content going into the cassette. Flushing is kept to a minimum too. When out & about cafes & public loos are used.We - the least intrepid travellers on the planet- are starting to go off grid. Our toilet cassette needs emptied every day. At most - a day and a half.
This is restricting our off grid adventures since we are not of the spade and bogroll variety.
We were thinking of getting a spare cassette but have no garage.
Does anyone else have a spare loo cassette gently sloshing in transit ?