HMMMM I mean I suppose the real response is really as long as I like given they need to be as long (or short) enough to at least hit the right spots on whatever I bite, also taking in to account my own snout and so on! Such is the nature

I think they rest about 3 or 4cm? Which feels long, certainly long enough to easily feed off most creatures!

I know when I'm particularly blood-starved they're longer! But generally I'm not really paying attention to that!

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OoC Note: I had to scramble with maths on this, calculating the scale ratio of my ref sheet based how it was after I printed it out for CFz, then how long the fangs were on the sheet and using that scale and approx 3cm is the number it spat out. The issue with this though is that that the size of the fangs on the sheet sit under 2mm so it's got some guesstimating in the response here.

But we are talking a shapeshifting creature and my assumption is that if the fangs needed to be shorter to feed off a victim who you don't to kill via too much tissue damage then the fangs could be shorter if needed. Likewise for a creature that was larger and the juiciest blood vessels being deeper then the fangs could be longer