thanks guys. It just seems a lot. I mean don't these fly at 600mph or something so an hour is 600miles. To put it another way it around 4200miles between the two. 4200miles / 550mph = 7.6 hours. Allowing for for winds and spinning globes the 6-7hrs or so hours seems correct on the way there. But 10 hours means we are flying at 420mph on the way back.

Its not important. Its just a big difference to my brain.