Oh well, the longest travelling i did was something like 6 hours to AUH and then another 14 to MEL. And around 2 hours on the ground in between. It was nice to walk around some, buti could have done actually the same during the flight as of course it was in business and there was enough space, not to mention that nice bar between business and first on the upper deck. In Economy that would have been living hell. And as i understand that singapore airlines flight will be all business, no economy on board. Probably a small first class if there is enough demand for it. Which provides more space and easy sleeping on full flat bed seats. And of course there is choice, one can always choose another option.