During one of my student teaching placements I did a bisque/glaze firing. The students had glazed their greenware with underglazes and two coats of clear glaze. If you want to do this in order to save time and electricity here are some suggestions:
1. The clay pieces are best flat and small, like tiles. This way they dry quickly and if they break, are less likely to stick to the walls/shelves of the kiln.
2. Place the pieces on stilts so they do not stick to the walls and shelves of the kiln.
3. Instead of firing with the glaze on, you could do a bisque firing and paint the bbisqueware with watercolor and Krylon spray for a shiny seal.