YOU SAID:

for a long time I would go to bed early.

INTO JAPANESE

長い間、私は早く寝るつもりでしょう。

BACK INTO ENGLISH

For a long time, I'll go to bed early.

INTO JAPANESE

長い間、私は早く寝るでしょう。

BACK INTO ENGLISH

I will go to bed early for a long time.

INTO JAPANESE

私はずっと早く寝ます。

BACK INTO ENGLISH

I go to bed a long time.

INTO JAPANESE

私はずっと寝る。

BACK INTO ENGLISH

I always go to bed.

INTO JAPANESE

私はいつも寝る。

BACK INTO ENGLISH

I always go to bed.