Time line of their trip to Italy...

First, I question the word only. (watching now so I check) Normally when arguing and upset one thend to exageate the offense not minimize it. I would suspect he said "over" (or should have and no one caught it).

But as for the time line.
1) Giovanni says he won't see her for a couple days, but explains he'll be back tomorrow night. So in essence that's only 36 hours.

2) Kate seems to be easily nauseated, therefore she would not have eaten on the plane, or even before flying. Since the flight is about 7-9 hours? add that to the time line. Also the body clock issue she might have not desired for becasuse her stomach was upset still. They also have the drive time between Paris? and Italy. And the 36/48 hr issue probably applies again.

Again Larry would have probably not have "declared" Kate gone until he awoke the next morning and she hadn't returned. I was also going to suggest that the time difference (8hr?) might add to the question, but I think it would make it worse.

The problem seems to be the issue of yesterday morning until this evening being two 'days', therefore incorrectly, 48 hours.

There is still a bit of a timeline problem, but not so much when you understand the 36 = 48 hour issue.

"A lie can travel halfway around the world, before the truth can put it's shoes on."