I'm watching Narnia and when Lucy comes back for the first time, she had been gone for at least 4 hours. It had only been 1 minute. So, if at the end 2 minutes had been 20 years, how does it seem like it had only been a few days since Edmund had left Jadis and Lucy had left Tumnus? Any suggestions? Am I the...
Narnia appears to be a spiritual world. So, the passage of time in it would be different than that of the waking world. It could probably be compared to a dream where days seem to pass by when it was only one night.
I have a brain problem so I can't think or remember their names.
It is whatever the author felt like putting in at the time. Maybe the Wardrobe decides when it would make sense to come back to, but it should always be a short amount of time.
So: it's whatever is convenient for the story plot, not something that the author set to a specific ratio as any sort of "rule" before authoring the books.
Everyone will have noticed it.
There is no definitive "it takes this long" when it comes to a fictional, magical realm.
As George R.R. Martin once put it, sometimes things just move "at the speed of plot".
Writers just use whatever time reference they want, because thats what makes the story interesting and magical.