How fast can you let anger go?

If you are on the verge of doing something wrong, is there a person in your life who can convince you not to do it? Would you hold your revenge or hate higher or the consoling words of a loved one? I have myself sworn many things in anger and then been talked out of it by reasoning of a family member. Or sometiimes it is time that cools me down and allows me to have a better perspective. After a reasonable amount of time.....i find that it wasn't as big a deal as I then, in my anger, thought it to be. Sometimes I even find myself attempting to change the mind of a person who is fuming with anger.