Just wondering about these rules of thumb that say for a relationship of a number of months or years it will take some fraction of that time to get over it. For example, the two common ones I've seen are it will take a week for every month of the relationship or a month for every year. The other is that it takes half the amount of time the relationship lasted (I hope not as that means I've got another 18 months of this hell).
How does anyone know how long it will take, is it based on some statistical fact? Or is it just made up?