This requires knowledge of how the water leaves the surface of the clay. You also need to know about how water moves inside the clay. First of all, since the water inside the piece cannot move as fast as the water can leave the surface, it is necessary to know how to slow down the movement of the water away from the surface. There are only three elements involved in the formula for water leaving the surface. Lower velocity air dries more slowly, cooler air dries more slowly, and higher relative humidity dries more slowly.
Lets look at that ware on a shelf.
The easiest way to do this is to cover the shelf with some plastic sheet. It keeps the wind out and allows the local humidity to build up as the water leaves the ceramic. If the air is too dry, put a pan of water on the floor under the shelf in order to make the humidity go up. Once the piece as stopped shrinking you can open the shelf and even turn on fans. Heated air is ok at this point since you can safely dry faster.