Think back to when you had to do something for the first time - were you really nervous? Did you rehearse what might happen over and over again beforehand? Did you evaluate how it went afterwards with "I could have done that better", "I should have done that", "I won't do that again". Now imagine having to do that in front of the world's press and that is what I mean by needing time between engagements.
She also needs to do the background briefing on who she is meeting, what the purpose of the visit is, go over what she will be saying formally and informally.
The Queen looks good doing it but she has been doing it for over 80 years. She grew up doing it. It is an unfair comparison and the Queen, like William do it automatically because they know no other life except one that includes this sort of thing. A better comparison was Diana and Sarah and how uncomfortable they were at first but after a couple of years they were much better. Camilla did, and still does, most of her engagements with Charles nearly 6 years in.
For Kate that isn't the case. If she say does a tour to Australia she will need to learn about our country, our culture, language she can and can't use, who the people are she is meeting, why she is meeting them etc. Now to do that for one engagement say on a Wednesday would allow her to prepare and reflect before doing another engagement a week or so later in a similar circumstance but if in a foreign country she has to take it all on board, have the world's press there reporting everything she says, doesn't say, does, doesn't do, wears, doesn't wear etc for an extended period of time. Another thing is that these overseas trips have to be in William's off-duty time from the Air Force limiting their private time again.
