A true is not depends on how long you know each other, lots of people know each other in a very short time but they get along well with each other. True friends are friends who give us hands when them, and true friend need never leaves you alone when you need somebody.
Sometime, friends that you know for long time and thought that they probably the true friends finally they really disappointed you. On the other hand, friends that u never even think that will be your true friend become your true friend. They not only give you hands but they give everything that they can give. Moreover, true friend true friend is not someone that u know, they show up when u really need help, and try their best to help that is what I called best friend for me.
In short, a true friend may show up when you really need help no matter how short you know each other.