I'm using a 1227 skutt 1980 kiln with sitter..its always been quite slow to fire. But, this is a first.. it have been on high for 48 hours and still not reached temperature. First- is that safe for it to be on for so long? Second it is hitting cone 5 but not cone 6. Its very close. My cone is starting to bend but its just not there. -also all elements, relays, and wiring are 100%. Is it ok to keep letting it run and hope it hits cone 6 in the next few hours or should i shut the kiln off since its been cone 5 for over 24 hours...?