Bone china oven times

[Johnellisimages]

Hi,

Does anyone sublimate Windsor bone china mug in a halogen oven, if so what time would you recommend. I found some timings from the forum temp 200 C degrees ....suggested times were 1 mug @12 min, 2 @ 15 min 3 @ 18min 4 @ 20min. I cooked 3 at the 18 min time and they were over done. I'm obviously going to cook for a shorter time, but I just thought i'd ask if anyone had experience of these mugs in the oven and what their times were.
Thanks in advance

[Johnellisimages]

Just for anyone that might be interested. Having messed about I figured 8.5 minutes at 200 degrees is what works best for me with the Windsor mugs.