I’m assuming that — much like truck drivers — there are legal limitations on how long a pilot can be on duty at the controls without sleep, which is why I was asking. As such I’m surprised there were only two pilots as I was under the impression there should always be two on duty at all times, and I’d have thought there would be at least one other pair swapping out during such a long flight. I admit I know virtually nothing about aviation regulations, but surely I’m not that far off in my expectations, am I?