Coming at this from training background? I think much of this "bond" is just a method used to make money for clinicians.
You do not have to "click" with a horse to have it well trained, well behaved, or have it do its best.
And furthermore? This is not how horses think. They do not have to click with horse to decide to follow the lead mare/horse. In fact? They may passionately HATE the lead mare/horse, and will still follow it anywhere.
The whole concept of only by clicking with a horse can you have a safe horse or trusting horse is fairy dust.
There are too many people who make their living riding many many horses in a day, and in some barns, horses come and go weekly. That trainer does not have time to click with each one, nor are they worried about human/horse relationship, other than horse is doing what it is supposed to do.
Much of this nonsense? Comes from people who do not make their living with horses. Unless of course they are clinicians who make a living out of promoting this foolishness.
Ok, the question.... I have clicked with some horses immediately. Just like you click with some people immediately when you meet them. I knew the horse in my avatar was coming home with me the second I met her.
Some horses I have looked at 2-3 times before the purchase. But, because I do NOT believe horses are companion animals, I do not believe they need a bond.