Time is an aspect of comfort. Within reason, I'd much rather have a 5-hour flight with the comfort level of domestic first class than a 13-hour flight with the comfort level of international business class.
(On the other hand, I typically fly internationally in coach, which often has as much seat and leg room as domestic first class.)
(On the other hand, I typically fly internationally in coach, which often has as much seat and leg room as domestic first class.)