The vehicle's speed decreases to 30 x 0.50 = <<30*0.50=15>>15 miles per hour when ascending to the top of the mountain.
So, the total time Crystal will have to spend going to the top of the mountain is 60 / 15 = <<60/15=4>>4 hours.
And the speed of the vehicle increases by 30 x 0.20 = <<30*0.20=6>>6 miles per hour when going down to the foot of the mountain.
So, the total speed of the vehicle when going down is 30 + 6 = <<30+6=36>>36 miles per hour.
Thus, Chrystal will have to spend 72 / 36 = <<72/36=2>>2 hours to descend from the mountain.
Therefore, the total hours she will spend to pass the whole mountain is 4 + 2 = <<4+2=6>>6 hours.
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