YOU SAID:

cannot believe how many people I will watch for hours

INTO JAPANESE

私が何時間も見ている人の数が信じられない

BACK INTO ENGLISH

I can't believe how many people I watch for hours

INTO JAPANESE

何時間も見ている人が信じられない

BACK INTO ENGLISH

People who watch for hours can't believe it

INTO JAPANESE

何時間も見てる人は信じられない

BACK INTO ENGLISH

I can't believe people who watch it for hours

INTO JAPANESE

何時間も見てる人が信じられない

BACK INTO ENGLISH

I can't believe people who watch it for hours