If you are merely looking for information, here it is.
It is not an instant death
Thinking this is genuinely scary when a throat is cut, it takes a couple of minutes for the person to become blacked out. It might take just some seconds in a few cases, while in some cases, the person might remain awake for minutes.
Dying of blood loss
There is a lot of blood loss when the throat is a slit, which means the body does not have much blood to support its life. Hence, before dying, he might first get unconscious because of extreme blood loss.
Drowning in your blood
There have been a few cases in which the lungs f the person gets filled with blood, and the person might end up dying drowning in his own blood. In such a situation, that person might feel that he is drenching in water.
Lots of pain
There have been a few survivors ad they tell you can feel immense pain if you try to cut your throat. Some people say that they might not experience any pain or feel less pain because of the shock.
You won’t be able to scream
As the throat gets completed damaged, the person can neither talk nor scream in such a condition. (See what does it feel like to die drowning)
You might become unconscious quickly
Various people get conscious instantly because of extreme blood loss. On the other hand, some people stay awake for a couple of minutes and bear the pain.
You will hear a loud heartbeat
A survivor cut his throat, and he said that he could listen to his heartbeat loudly in his ear. This is because the heart tries to maintain blood pressure, but sadly, it fails in most cases.
Feeling the warm blood
When the throat is cut, the warm blood spreads all over, and the person would feel the warmth of it.
It depends on the cut
The pain and the time the person remains conscious solely depends on the depth of the wound. The more in-depth the cut would be, the person would die faster.
It depends on the position of the neck
If the person is lying in a situation where the pace of the blood loss is less, then the person would stay responsive for a more extended period and vice versa. (See what does it feel like to die)