LAX AKL punching into the jetstream is an FTI of 13:00 hrs and SIN FRA is 12:45 hrs without the possibility of a 3 hour limp to safety if half the noise stops, so from how this non pilot sees it it is doable in an A332.
Please feel free to pluck the budgie here, as I am just working on raw data available to me.
best all
EWL