Sadly, MM's right.
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If you think you are going to get from Philly to Chicago in 12 hours, it ain't gonna happen. That's 780 miles. That's going to be 14 hours PLUS whatever it takes you to get out of Philly and what it takes you to get INTO Chicago with MINIMAL stops if you value your driver's license.
You need to recalculate all your times accordingly. Mapping programs do not take reality into account.
Will do, thanks! Google has been pretty reliable thus far in other trips regarding time, I don't know that I've ever really been late with regard to the times they've given me. Do you really think the time will differ by that much? I drive barely above the speed limit as well, +5/10mph tops.