Here's what I wound up with after doing the tutorial, which IIRC, suggested about 100 or 150 samples, and then I tried it with about 300 samples. I finally did it with 1,000 samples, but the inside of the mug is still a little grainy, so not sure how high I should've gone with the samples to get rid of the grainess.

Cycles Coffee Mug

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OK . . . Where's my chocolate?

Butterfly Dezignz