Our son got up at 6pm from nap, and fed him, prepared dinner, drank a lot of water for kiln work. Takuro came home around 7pm and then we went to work on kiln until dark. We put several more bricks on each side for 1 and a half hours. You might think it would be able to be more faster, but we have to kneed clay and pack clay inside of bricks before laying it so that it takes longer than it looks like.
Just keep laying bricks a little by little everyday... we believe that tiny progress makes huge difference later. Gambatte!