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It should happen nearly instantly when things are right,
Nothing should be foaming except at very high voltages(which you are using but shouldn't be).
I've never heard of using ti as a cathode and I'm inclined to think that's a major issue here. The cathode should be stainless steel, usually stainless steel foil.
You said you clipped the alligator clip directly to the ti you are anodizing. That's OK, but the clip MUST NOT be allowed to touch the liquid.
Try another cathode and let's see if things improve....
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