That length of time in front of a monitor will cause eye strain. The best solution is to take breaks away from the monitor or at the least turn away from the monitor frequently and focus on varying distances. The monitor should be about arms length away and the top of the monitor should be about level with the top of your head.
The settings are not the same for everyone but you could try increasing the viewing size.
The settings are not the same for everyone but you could try increasing the viewing size.