This is a Premier Route (N-S or S-N). 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.

Admin note: The southern terminus for this FKT is Whitney Portal, even though the JMT ends at the summit of Mt. Whitney.

Exhausted, dehydrated & humbled. I arrived 7 minutes ahead of scheduled shuttle pick-up. -- from the journal of Kent Holder's Chilkoot-in-a-day run, 23 July 1998

The following description is from www.n2backpacking.com: