I'm waiting for someone so long. I do not know whether he is aware that there are people waiting. Nothing more. He would not know. Now I just want to talk to some people. He realized that someone was waiting for him.
I'm waiting for someone for a long time. I don't know if he will know that someone is. Nothing much. He didn't know. I just want to talk to someone when he will know that there is someone waiting for him!