It requires about 13.5 hours of driving time.
6 hours
About 7 hours and 10 minutes.
5 hours 52 minutes
It depends which form of transport you take and the class of travel.
A flight from Chicago to Denver would take about 2 hours.
31 hours
It take 4 hours and 50 minutes to St.Louis from Chicago.
Google Maps estimates the driving time as 45 hours.
About 13 hours.
First class mail delivery takes 3 - 5 days.
15 hours is your answer :)
3 hours