So... I have to arrive at the company office at 5:45am to ride a shuttle bus 60minutes to the job site for a 7am start time.

We leave at 5:30pm and don't arrive home until about 6:30-7pm.

Does this constitute a 12-13 hour day?

BTW this is in the great state of North Carollina where our employers aren't required to give us notice of overtime, can terminate if we don't work overtime, etc. How nice.

The travel time rules can be found in 29 CFR 785.33 (http://www.dol.gov/dol/allcfr/ESA/Title_29/Part_785/29CFR785.33.htm) - 29 CFR 785.41

There are no states that require the employer give advanced notice that overtime is going to be required.