Curing Polymer Clay
Polymer clay can be baked in a regular kitchen oven or convection oven. If you plan on doing massive amounts of polymer clay baking, I suggest purchasing a counter top convection style toaster oven.
Depending on the brand of polymer clay, it is suggested to follow the direction on the package for baking. The minimum time required for curing is generally 15-20 minutes per quarter- inch of thickness at the thickest spot.
Some light-colored clays will darken more quickly than others, as will the translucent or any clays with translucent in their makeup. Try baking these light colored clays at a lower oven temperature for a shorter time. When baking your polymer clay creations, its best to put it on a ceramic tile which can be purchased at any home improvements store. There are several sizes that you can purchase. I have on hand the small 4” x 4” up to large 12” x 12” tiles. Don’t get tiles with textured surfaces, unless you want your polymer clay baked with the impression of that texture. Purchase ceramic tiles with a smooth surface.
The one problem with the smooth shining surface of ceramic tiles, is that the clay will develop a shiny spot where it has touch the surface of the ceramic tile. 
There are two way around this. You can put parchment paper between the clay and ceramic tile or use terra cotta tiles. Something to remember: ceramic tiles & metal baking pans may heat up a bit more.