How about a nerve compression analogy? You can describe this as a car running over a garden hose in the driveway. If the car is on the hose for a month it is very unlikely to return to its normal shape quickly. If the car is on the hose for a day, the return of the shape occurs much more quickly. So, if the nerve is compressed for a long period of time, the function will take longer to return.
Contributed by Jean Kuckhut OTR,CHT