The book is Harry Potter The Deathly Hallows By J.K. Rowling. The main characters in the book are the same as any of the other books Harry Potter, Hermione Granger, Voldemort, Dumbledore, Dobby, Draco Malfoy, and some others. The quotation is about how it took a whole another hour to clean and put something away.
It took another hour to empty it completely, throw away the useless items, and sort the remainder in piles according to whether or not he would need them from now on. His school and Quidditch robes, cauldron, parchment, quills, and most of his textbooks were piled in a corner, to be left behind. (p.25)
I chose this quotation because it reminds me of when I thought it would only take an hour to do something but it ends up taking a whole other hour.