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.
In between those two extremes is quite a lot of ground in which it is not clear what you should do.
There is a related complexity to traveling through a sequence of doors and deciding whether person one should:
- Hold the first door and let person two continue through to be the holder for the next door, or
- Pass through, hold but hand-off the door to person two, and continue on to hold the next door
Finally, there is the question of “Thank You” etiquette – one per door, one at the beginning that covers the rest, or one at the end that wraps up the transaction.