YOU SAID:

I am bored at work with 50 minutes until I finish

INTO JAPANESE

私は50分で終わるまで仕事に退屈している

BACK INTO ENGLISH

I'm bored with my work until it's over in 50 minutes.

INTO JAPANESE

私は50分で終わるまで仕事に退屈しています。

BACK INTO ENGLISH

I am bored with my work until it is over in 50 minutes.

INTO JAPANESE

私は50分で終わるまで仕事に退屈している。

BACK INTO ENGLISH

I am bored with my work until it is over in 50 minutes.