YOU SAID:

I have been waiting for four days

INTO JAPANESE

私は4日間待っていた

BACK INTO ENGLISH

I have been waiting for 4 days.

INTO JAPANESE

私は4日間待っています。

BACK INTO ENGLISH

I am waiting for four days.

INTO JAPANESE

私は4日間待っている。

BACK INTO ENGLISH

I have been waiting for four days.

INTO JAPANESE

私は4日間待っています。

BACK INTO ENGLISH

I am waiting for four days.

INTO JAPANESE

私は4日間待っている。

BACK INTO ENGLISH

I have been waiting for four days.