I do have experience.
Something that stores two weeks' worth is not a composting toilet, despite what advertising may claim. It's a chemical free porta potty that you can, if you wish, empty into a composting pile or container.
A true composting toilet stores the waste until it is fully composted. And yes, this takes months or years depending on conditons. Never weeks.
The porta potty version could work for an rv if you only take short trips and have a setup for composting poo at home. Many people on this forum travel for longer periods of time, or full time, so our responses tend to assume that.