Door Relationships
What is the range of distance for which you need to hold a door open for the person behind you?
There is a distance at which you would be an ass not to hold it, perhaps even injure someone by closing it in his/her face. And there is a distance that is so far that you would put undue pressure on someone to speed up as not to make you wait and/or look a little odd to be so determined to hold the door for them.