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xkcd #3109: Dehumidifier
(imgs.xkcd.com)
Title text:
It's important for devices to have internet connectivity so the manufacturer can patch remote exploits.
Transcript:
[A store salesman, Hairy, is showing Cueball a dehumidifier, with a "SALE" label on it. Several other unidentified devices, possibly other dehumidifier models, are shown in the store as well.]
Salesman: This dehumidifier model features built-in WiFi for remote updates.
Cueball: Great! That will be really useful if they discover a new kind of water.
Source: https://xkcd.com/3109/
Turning the dehumidifier on ten minutes early means there aren't ten to twenty minutes where the shower's running with no dehumidification where condensation is able to settle on all the walls unimpeded, and the extra condensation takes a couple of extra hours to dry out again. Regardless of whether my family try to turn off the dehumidifier prematurely (and I only mentioned that as why I'd originally set a hygrometer up to graph the humidity in the bathroom, not as an ongoing problem), if that happens several times a day when someone showers, that's more than enough dampness for black mold to form.