@rittels I forgot to mention that service ceiling climb rate (where normally aspirated engines loses their vertical performance down to around 100 ft/min) is also needed, so it will be 3 entries total for a climb phase:
vertical speed at sea level;
vertical speed at service ceiling;
and air speed.
In this case the final vertical speed (and thus, enroute time) will be dependent (calculated) on Min and Max values.
For example, if it set Max value to 500 ft/min (mean sea level) and Min value to 100 ft/min (e.g., at 16000 ft MSL) my vertical speed will be 400 ft/min at 4000 ft, 300 ft/min at 8000 ft etc.