Press the Solutions button to see what Design‐Expert recommends for the most desirable departure. The program now chooses a departure time at random and climbs up the desirability response surface. It repeats this process over and over,
but in this case, the same point (within a value “epsilon” for the duplicate solution filter – see Optimization Options above) is found every time – a departure around 33 minutes beyond the earliest start acceptable by Mark for his morning commute.
(Your result may vary somewhat due to the random starting points of the hillclimbing algorithm.)