Why do you have Screen Saver (who uses that now a days) or System Pause enabled. They should always be disabled when doing rendering that takes some time such as hours.
Having your computer automatically turn off its display is the new “screen saver” – it saves energy, reduces your electricity bill, and increases your battery life. Screen savers may look pretty, but they do it when no one is looking
To what format are you capturing? Please give us some more information on your input and output formats