10 to 15 priests.. that is way too many... I don’t even want family pets around when this work is done as it creates hiding places. Never to be done in a public forum.
They will jump from one person to another. You don’t want a vulnerable priest in the room or you end up working with them as well. However, the more people that pray for the young woman the better. Prayerful energy is like a blow torch of fire to them.
I’ve had them instantly appear in other locations many miles away if they slip away while the work is being done. It is very important to properly dispose of them and heal the wound in the soul that allowed them into the person.
I usually ask the demonic spirit what happened to the person that created the wound allowing them to enter and they tell me. Often they enter children when they are molested from the person who is perpetrating the harm.
I don’t know how many priests work on exorcism, they often just pray and he isn’t even there.