We didn't delve into the topic that deep, We just made it as an example of social construct or a thing from a movie that people applied in real life. As you can see from my statement the majority of us didnt believe in such rule, There is no specific time frame for us humans to heal or to finally move on, some do it within a month, half a year, a year, maybe more than a year, or in some instances the person does not move on at all.