I read the new book by Haruki Murakami that I had eagerly awaited in one sitting.
この場合、次のような言い方ができますよ。
ーI read the new book by Haruki Murakami that I had eagerly awaited in one sitting.
「待ちに待った村上春樹の新刊を、一気に読んだ」
to eagerly await で「心待ちにする」
in one sitting で「一気に・一回で」
ご参考まで!