At my DD2 the fan also holds its low speed for a very long time.
I'm not sure at which temperature it speeds up, as I never looked at it, but it goes down from round about 900 rpm to 600 rpm when the driver temperature is back at 50°C for around 1 minute ( so maybe below 50.5°C?).
So I think it's the same when it heats up and the fan speeds up when the driver gets over 51°C.
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