Suppose a novice plumber -- a completely hypothetical novice plumber -- removed the top heating element in their electric water heater before the tank had sufficiently drained, resulting in about a gallon of water spurting out not only into the basement, but also down the inside of the device, soaking into the insulation to the extent that the foam around the lower heating element and thermostat squishes and dribbles forth when squeezed. (Suppose said hypothetical novice plumber is not a complete fool -- the power to the water heater was cut off before the mishap and remains so now.)
Suppose this imaginary person would like to stop taking bucket baths in a precarious blend of stove-boiled water, liquid ice from the tap, and shame, and return to the glorious steamy showers they took for granted as little as a week ago. Suppose this imaginary person shares this home with others, and that a 12-year romantic relationship hangs in the balance.
Even a rookie can see the potential risk in wiring everything back up and flipping the breaker while there is enough moisture in the insulation to irrigate a small orchard. Suppose a fan has been blowing on the heating element/thermometer access points for 48 hours. Suppose that a dehumidifier has been running constantly, and that even a hair dryer has been employed from time to time. What else would you advise our protagonist do to dry out the obstreperous water heater? How much more time must elapse? How dry is dry enough?