It will depend on the company travel policy. My F200 firm allows J or F when the "block time" is greater than 8 hours regardless of destination. Some of us interpret that as total travel time and book J or F with no push back. A couple of my buddies travel on business to Hong Kong and Taiwan a couple times a year in Y. I've flown Y to and from NRT to the West Coast several times and lived to tell the tell.