Hi Yes I have seen this - can you elaborate on its usage ?
That's not much to say: there's a time per passenger and a minimum time. The actual time is calculated with this formula:
( time_per_passenger * n_of_passengers ) + minium_time
And the dialog will indicate the result with the numbers you inserted, with some typical passenger figures (100, 200, 500, etc.) The number of passengers is estimated by calculating the total number of load stations, and divide by 220 lbs, which is the industry standard to estimate weight of a passenger + his luggage.