Yeah, this is a common thing in series or films, usually the non-interesting stuff gets invisible, so even though the action may span on several days, you don't always notice it.
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I'd say many of the storys with Kit happen in the Summer Holodays when he plays a major part or the story spans a long time (unless it's in Cape Suzette).
Good point! It's usually not explained but I believe most episodes with Kit happen either during the weekend or during vacation. And the episodes without Kit may be explained by the fact it happens during the week so he's at school. (But there are strange cases, "The Time Bandit" happens on Friday and yet Kit isn't at school?)