Not that hot, maybe 50-60C, enough to get the moisture out of the filament and into the desiccant while not melting your spool or filament.
Was thinking to add a small fan to it one of these days, connected to a battery and on/off switch, but it's working really good as it is.
Just to add to this, i print mostly PETG and PETG-CF, barely any PLA.
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