YOU SAID:

I have been in this room for an hour

INTO JAPANESE

私はこの部屋に１時間います

BACK INTO ENGLISH

I've been in this room for an hour.

INTO JAPANESE

私はこの部屋に１時間います。

BACK INTO ENGLISH

I have been in this room for an hour.

INTO JAPANESE

私はこの部屋に１時間います。

BACK INTO ENGLISH

I have been in this room for an hour.