On 12/12/2015 I ran out-and-back along the length of the Notch Trail at Hudson Highlands State Park in 2:10:30. I began at the Route 9D trailhead, ran to the end of the Notch Trail (where it meets the Washburn Trail and Nelsonville Trail), then back to the 9D trailhead. My Garmin watch has it at 11.3 miles, though the official Hudson Highlands map lists it as 12.2 (6.1 each way).
Here is the Strava record: www.strava.com/activities/449867457
The Notch Trail shares several miles with the Breakneck Ridge Trail and provides a good mix of steep climbing and flat runnable sections.