They are saying that their life is more important to them than a pittance of extra money and there is no amount of overtime (within reason, assuredly: if I were

They are saying that their life is more important to them than a pittance of extra money and there is no amount of overtime (within reason, assuredly: if I were willing to pay a billion dollars an hour that would likely work for at least the 46th hour ;P) that would convince them to stay and work longer than a reasonable amount of time.