準備は丸一日した is there a particle missing?


I was wondering for this line:

> 緊張してるの？準備は丸一日しただろう。

Let's say A says this line to B. Does it sound alright id I say:

"You prepared the whole day, didn't you?." (so, why are you nervous?). If I
rearrange the sentence as 丸一日準備をしただろう is it the same meaning?

Is 丸一日した an adverb here? Kinda feel that maybe the に particle was left out, is
it the case? (the character A who speaks has a colloquial way of talking, with
many informal, shortened phrases, so I'm thinking that leaving out some words
is appropriate for him).




丸一日した is not an adverb (it clearly includes した which is a verb), but 丸一日 is
adverbial. Nothing is omitted after 丸一日 because it works as an adverb on its
own. Remember that `number + counter` works as an adverb that describes an
amount in Japanese:

  * リンゴを2個買います。
  * 鉛筆を1本ください。

The same goes for a time length:

  * 日本に3日滞在しました。
  * 15年間東京に住んでいます。
  * 10分待ってください。

丸一日 is in the same vein. 丸一日準備(は/を/φ)しただろう means the same thing. に is used to
describe _when_ something happens (e.g., 1998年に = _in_ 1998; 日曜日に = _on_
Sunday), but it never marks a time length.




丸一日した is not an adverb (it clearly includes した which is a verb), but 丸一日 is
adverbial. Nothing is omitted after 丸一日 because it works as an adverb on its
own. Remember that `number + counter` works as an adverb that describes an
amount in Japanese:

  * リンゴを2個買います。
  * 鉛筆を1本ください。

The same goes for a time length:

  * 日本に3日滞在しました。
  * 15年間東京に住んでいます。
  * 10分待ってください。

丸一日 is in the same vein. 丸一日準備(は/を/φ)しただろう means the same thing. に is used to
describe _when_ something happens (e.g., 1998年に = _in_ 1998; 日曜日に = _on_
Sunday), but it never marks a time length.

