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Credits to [Triplehorn,v42,p164].

"Earth's Internal Structure
One way to sense the scale of the earth's internal structure would be to drive through it in your car, as on a vacation trip. Visualize an interstate tunnel going straight down through which you could maintain a comfortable 100 km per hour. Allowing for meals and rest, you could probably maintain this rate for, say, eight hours a day."

Depth of milestone (km) / 100 km/hr = hrs
(For US road maps: km / 1.6 = miles)

depth	time	country	sideways
0 km	start	surface	San Francisco
		Continental crust	across the bay and through Oakland
35 km	21 minutes	bottom of crust	Benecia
		Lithosphere	On Rt 80
65 km	39 minutes	top of mantle	Fairfield
		Mantle - low velocity layer	Rt 80 through west half of CA
165 km	99 minutes		Sacramento (mid CA)
		Mantle	Nevada, Utah, Wyoming, Nebraska
2885 km	3.6 days	top of core	Des Moines, Iowa
		Core	Illinois, Indiana, Ohio, Pennsylvania, New Jersy, 1000 miles of sea
6371 km	8.4 days	center of the earth	in the Atlantic, by Nova Scotia