I hate the sound of car horns, so I never honk. I will usually wait at least five minutes past the time I was supposed to be there unless I'm in a serious hurry, because I assume that they know what time it is, they are looking for me, and are just rushing to finish something. I might shoot a text or go to the door if it was really taking forever.
Nobody ever has to honk for me. This past winter, my friend and I took turns driving to agility practice, and my mother was
appalled that I was not waiting in the driveway for her when she arrived. It was winter, it was late evening - no way! I was standing at the door in my boots, with just my coat to put on and Gusto's leash, but that wasn't "ready" enough for her. It is the age of smart phones - most of us can entertain ourselves for 3 minutes in a car just fine while waiting