Clay should not be fired until it is bone-dry. To check for this, pick up your pot and feel it all over. If it feels cool to the touch, it is not yet bone-dry. (The coolness is due to the water evaporating out of the clay body.)
Drying time varies according to the humidity of the air. Generally, a pot should dry completely in one to two weeks. If a pot is drying faster than that, cover it lightly with plastic. Drying too fast can result in the pot cracking. Be aware that greenware is very fragile; dry your pots in a place where they won't be moved about, bumped or jostled.
After you pot is dry, it is ready to be bisque fired. Once bisqued, you can apply underglazes and glazes, then put your pottery back in the kiln for its glaze firing.