No. It's one hour more than on the timetable. The flight plan is redone for every flight and the actual timing will vary.
It's difficult to say without seeing their actual flight plan. Do they normally take off at max take off weight, or is there some margin? How much fuel to they normally plan on arriving with? NYC was one of those places where I carried much more than usual ('cos US ATC was so unreliable) but that will give them margin for a longer flight as well. Aircraft are very often stretched right to the limit, on much shorter routes, because they're loaded up with cargo. And by the same token, I recall flying out of DFW, on a normally very limiting route, with almost 20 tonnes of unused weight. The limits are quite variable, and you need to see all of the parameters to be able to work it out.
