How long does it take to get North Dakota on a train from Washington?

Well, after February 16 im supposed to make a trip by train my mother in North Dakota to see my sister and I wondered how long it takes to get

You do not say where in North Dakota, then according to programming for the Amtrak Empire Builder is just under 27 hours from Seattle in Minot, North Dakota. As might be longer or shorter depending on where you travel along of the line you go.