This is a Premier Route. To claim an FKT on this route, you must meet a high standard of documentation and verification. See details here: https://fastestknowntime.com/premier-routes.

Via Alpina -  Original Red Trail is a 2650K trail that goes through all Alpines countries.
The trace is fully specified and detailed on the official website of the trail:

This 2.1 Mile Blue Blaze Trail is near Killingly in Connecticut and has easy parking at both ends of the trail. The trail has a superb and wide variety, including woodland areas, steep cliff lookouts and bog sections. Its popular half way along with climbers too. This trail has relatively easy terrain and is a good trail to take the whole family too. The path's only real challenge is that the blue blazes are faded and can be confusing in places.