Time and distance are not important between friends. When Friend are in the Heart, they remain there forever. You may be busy but trust me you are always remembered.
A warm "hello" doesn't come from the lips, it comes from the heart; doesn't have to be told, it has to be shown; doesn't have to be given, it has to be sent.
A true friend is like the best book, sometimes, the cover may not be so elegant but the contents are like bars of gold that you can treasure for a lifetime. Take care!