くらい
approximately, about
Seven hours. Or six and a half. It was dark and you weren't checking. くらい is the shrug you hang on the end of a number.
ぐらい is the same word and just as common. Not 暗い くらい, which is dark.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.