We drove from Vegas to Alaska this summer in 3&1/2 days. We only made it just north of Helena, MT the first day because some Hooters Chicken Wings tore up our insides. The trip can be done from MT in two days with swapping driving times. The scenery is great, and we drove with out 3 year old in the back seat. No problems whatsoever. You'll enjoy the drive and the scenery.