Have you ever been in a situation where one of your staff went offline without any update that he or she wouldn't be online for a particular period of time? How long would you be willing to wait for the staff to come back online before taking the decision to terminate or fire the said staff from his or her position? I would give the staff member at least 2 month after trying to reach him or her through email. If I don't get any feedback after 2 months, I would be forced to let the staff off.