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I wondered about this so I did a bit of work with my thermometer and glass hario switch.
I closed the valve so no water could get out and filled the entire thing with boiling water with a thermometer inside, the max temp the thermom read (after about 45 seconds) was 77 degrees, it then started going down. I dumped that water and refilled it with more boiling water, the highest that got was 84.
So if you're trying to maintain 92 degrees or so, I would say that you would be there for a while if you're just running water over the ceramic.
Whether you'd find this drop in temp affected flavour or not is another thing entirely... but this is the kind of thing people on the sharp end of stuff worry about and why they do things like develop insulated drippers, lids, cozies for their drippers, etc.
Belagerent-
I was about to mention that my measurements were limited to the heat sensitivity of my fingers. Thanks for clearing up!
Quick research also concludes that plastic beats ceramic in basically every aspect that matters for flavour. It heats up faster and keeps the heat longer thus allowing a faster and more consistent brew.
bibimbap
Like how much longer? I would say that the ceramic V60 gets sufficiently hot during rinsing and keeps that temperature easier than the plastic one. Especially if you rinse with boiling hot water.