[magicalhippo]

While slightly taller, around 200 meters or 650ish feet higher than Mauna Kea, Google Maps says it takes 94 hours to walk from Morrow Beach (closest I could find) to the top of Mt Whitney, compared to just 23 hours from Waikōloa Beach to the top of Mauna Kea.

So in that regard I kinda feel Mauna Kea has an upper hand still. But good suggestion, it is technically higher.

[votepaunchy]

Death Valley is 282 feet below sea level and the aforementioned 135 miles from Mt. Whitney (Portal, then 11 miles to the summit).

[magicalhippo]

Ah had somehow never picked up that death valley is below sea level. Good contender then!