Dan Winterland
Had this once with a fairly inexperienced crew heading across pond on Albert. Crew were having this discussion whilst trying to keep the discussion out of earshot of old and wrinkly STANEVAL Nav who had jumped the operating nav. Whilst ageing Nav was down the back, supposedly knowing nothing, Captain decreed that it would be too obvious with him on board and a waste of fuel/engine life etc. STANEVAL Nav returns and snatches log sheet from operating nav and writes in the landing time to make lunch(still 5 hours out) stating "now we can just get there in our own time - just make the rest of the times fit!". Bloody funny.