Two really long days if you drive like I do ; fast and relentless
I start early , end late , drive at +10mph and stop for nothing other than gas en route
Food is in a cooler and pee goes in a coffee can
Three still long days if you drive like normal ppl do
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The first thing you need is a full sized spare bc there is a lot of empty real estate out there that you can't cover on a space saver donut
Carry a tarp that you can attach to your car and stake out bc waiting for help in the shade is better than waiting for help in full sun
Coolers obviously
AAA membership obviously
Find a copy of this book
http://www.thenextexit.com/
http://www.amazon.com/The-Next-Exit-2011-Interstate/dp/0971407398
Know that if go I-15 N > I -70 E > I -76 E> I-80 E >1-55 N there are very few gas stations on I-70 in UT so fill up in St George or Cedar City