I read the content of the link. Got to say each diferent case has its own rules and respective solution. If a lot of time goes by then they create a new and more updated character/plot/background for the story, if the story is based on an infant then no one in the show ever ages, then it says that sometimes 1 year in real life can equal to 1 or 2 days. But to me it all sounds to convenient, its likes, its all based on a non existing universe all disorganized and crumpled together.
Example: speaking of Det. Conan, time does pass by but aparently 1 year is equal to 10000 months. Aparently time isnt based on real time its based on punctual decisive events that happen in the story like the begining, climax and end of an arc. Yet with det conan, its really weird because even if the author didnt mean to, there is a sense of real time goin by, like when your watching a tv show(NCIS, CSI, Bones, etc), of course im comparing aging people to fiction characters but its not the case. I guess what im trying to say is that you get a feeling that in between episodes time does flow by.
Then again i could be thinking it to much, instead of just accepting it and enjoying the show.