They flew (not counting the trip back home) about 10 or 12 thousand miles (a guess) across 8 or so timezones. Can you say jet-lag?
They were on and off helicopters, float planes, canoes, dragon boats and cabin cruisers, and in and out of limousines, SUVs, stagecoaches, and motorcades.
They slept in about 8 or 9 different beds, including the Winnebago-like cabin on the Canadian plane, and the tiny ships cabin on the Montreal to Quebec City cruise. Have you ever had to get dressed, groomed and made-up multiple times a day in a strange room every day, with different lighting and mirrors? Not easy. (And yes, we all know that William slept in his blue suit and just rolled out of [strange] bed every morning- he's a bloke!)
They had to use dozens of different bathrooms, making sure everything was tidy, zipped and tucked before re-emerging to the gaze of thousands.
Their pictures were taken every public minute of every day, by news organizations, and by the public.
(They could only hope there was no spinach or orange pulp stuck in their teeth.)
They shook thousands of hands, and engaged in hundreds of conversations with total strangers. With the possible exception of some polo players and David Beckham, they knew no one. And I would guess that the majority of the conversations-including, no make that especially, those with the Hollywood types- were BO-RING.
Every word they said, every movement and gesture they made, and every look they shared between them was observed and analyzed ad infinitum. They had to be aware of that every moment of the tour.
And fer cri-yi, they are newlyweds who plainly adore each other. Yet they couldn't pat, hold hands, snuggle, cuddle or kiss when they were under the eyes of millions world-wide. I've been married for eons, but my husband and I can't resist being appropriately affectionate with each other.
And every morning, no matter how they felt, nor how much they wanted to sleep in, nor how little they wanted to be dutiful Royals, they got up and performed in an admirable and charming manner.
Does anyone really think that being a Royal on tour is easy?