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Hi, I have owned a second hand Duncan EA 1020 studio plus kiln for around 12 years and have mostly been firing at the lower temps from cones 020 to 04. Cone 04 usually took around 6 hours. This kiln is an Automatic/Manual kin. 30amp. The Kiln is rated to fire to cone 8. It has a 20 hour timer. Element ohms have been tested and are slightly better than required Recently I wished to fire to cone 6. This has become a sticking point. I did a firing mid last year for cone 6, set the timer for 15 hours. The Kiln reached cone 4 almost 5. The next cone 6 firing was 20hours and the sitter shut it off. Witness Cones 4 and 5 were fully bent cone 6 was not quite there. Due to the time taken none of my glaze finishes were right and I ended up with a lot of browns which wasn't expected. I thought this was a bit long but I'm not sure with this kiln. If it takes 20hrs to reach cone 5/6 It is never going to reach cone 8. The kiln slows right down on ramp after 900degrees celcius. I think it is relying on soak times to get to the required cone. I've emailed paragon several times about parts and advice, they seem to think 10 hours was reasonable for cone 6. But if cone 04 takes 6 hours then I'm not so sure. I have replaced elements, relay switch, fixed Interval timer and about to replace the Repeat Cycle timer. As I'm running out of parts to replace and can't seem to find any information on how long this kiln would normally take to reach the temps I'm hoping someone here could answer this. Thanks for your time. Regards Kerry