Every kiln has uniqueness, you can't generalize it or any method about the kiln such as firing method, increasing temperature, etc. Even in same size of the kiln, potentially different for each other.
Usually the kind of clay determines thermal shock strength. Clay consists a lot of free quartz you must be patient for opening the kiln, but for earthenware you no need worry to much. Also the pot in slip casting technique is more stronger then other technique such as throwing or slabbing in thermal shock phenomena.
I usually open the kiln in step by step. First I open the spy hole. Than if fell warms in your hand, I open the door kiln just little bit. Every a half an hour I open just little bit too.