Scuzi said:For best results a fire will be lit in it for about 2-3 hours to heat it up. The embers will then be removed and the clay and firebrick will maintain the temperature in the oven at around 300C for up to 8 hours.
Another option is to keep the embers going in the base and cook stuff over a grate which can be set into it.
Not a good way to make a quick luch then if its not all fired up and ready to go