Read "The House of Arden" by Edith Nesbit online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
Three days, because there had been a quarrel. But days pass quickly when the sun shines, and it is holiday-time, and you have a big ruined castle to explore and examine -- a castle that is your own, or your brother's.
"After all," said Elfrida sensibly, "we might quite likely find the treasure ourselves, without any magic Mouldiwarpiness at all. We'll look thoroughly. We won't leave a stone unturned."