650 miles
About 8 hours
By road, according to mapquest, it is 617.13 miles between Detroit, MI and Trenton, NJ. I would take this as a very approximate number.
Halfway Points
Illinois is approx. halfway between New jersey and Colorado.
The Halfway point between Waretown, New Jersey and Gilbert, Arizona is Hoberg, Missouri.
From Trenton, New Jersey, it is 604 miles to Detroit, Michigan. It would take eleven hours.
New Jersey.
Delaire Landing, Pennsylvania is halfway between Jackson & Doylestown
1/2 is the halfway point
The halfway point is New York
Dayton