With the right conditions and balance of 'ingredients', composting human outputs will happen fairly quickly (around 12 months), won't smell during the process, and will create a safe, sweet-smelling compost that you can use in your garden/grounds around trees and shrubs.

A composting toilet typically takes 12 to 24 months to fully transform human waste into safe, pathogen-free compost. In a standard self-contained system, the initial "breakdown" happens quickly through aerobic decomposition, but the material must undergo a "maturation" phase to be biologically stable. In 2026, many off-grid homeowners use a two-bin rotation system: one bin is filled over the course of a year, while the other is left to "cook" and cure for the following year. Factors such as temperature, moisture levels, and the carbon-to-nitrogen ratio (usually balanced with sawdust or peat moss) heavily influence the speed. While "hot composting" methods can reduce the time to 6 months, most experts recommend a full two-year cycle to ensure that intestinal parasites and hardy bacteria are completely eliminated before the compost is used on non-edible garden plants.