A friend of mine works for a service company in Africa. Getting USD9333.28/month for 7/3 rotation.
So, I agree with what you said. Everything comes with a sacrifice and comfort zone is the very first one to go

8 hours is indeed normal.
But some jobs just cannot be done in 8 hours and/or runs everyday of the year that they need you to work for 12 hours or more.
And usually you get compensated with overtime bonus or something else.
I have to work on 12 hour shift daily. Excluding 1 hour of handover to the next person. No rest time.
I eat while doing the job and toilet breaks has to be quick so as not to miss any parameters on the job.

But of course, I knew all that before I accepted the offer. So, does not count as being abused.

Indeed I am. Also because I work without holidays/weekends for 90-120 days straight before going home.
But after overcoming the initial stages of learning, then comes the easier life..
Now I am able to get myself free couple of minutes every couple of hours just to check on FB for family and friends.