There are You-Tube video's of the process. You could watch one and using the timer on the bottom of the screen figure it out. Don't forget to add in the coffee breaks.
Brent
"All of the world's problems are the result of the difference between how we think and how the world works."
Really depends on how they are offloading the material, how many cars/compartments can be emptied at a time, etc.
Mike
how long does it take to unload a 100 car train?