This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) the answer is unique, (iv) its answer is a continous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage

CHAPTER XVIII.

_A BRICK TURNS UP_.

The snow had been all night falling silently over the long elm avenues of Springdale.

It was one of those soft, moist, dreamy snow-falls, which come down in great loose feathers, resting in magical frost-work on every tree, shrub, and plant, and seeming to bring down with it the purity and peace of upper worlds.

Grace's little cottage on Elm Street was imbosomed, as New-England cottages are apt to be, in a tangle of shrubbery, evergreens, syringas, and lilacs; which, on such occasions, become bowers of enchantment when the morning sun looks through them.

Grace came into her parlor, which was cheery with the dazzling sunshine, and, running to the window, began to examine anxiously the state of her various greeneries, pausing from time to time to look out admiringly at the wonderful snow-landscape, with its many tremulous tints of rose, lilac, and amethyst.

The only thing wanting was some one to speak to about it; and, with a half sigh, she thought of the good old times when John would come to her chamber-door in the morning, to get her out to look on scenes like this.

"Positively," she said to herself, "I must invite some one to visit me. One wants a friend to help one enjoy solitude." The stock of social life in Springdale, in fact, was running low. The Lennoxes and the Wilcoxes had gone to their Boston homes, and Rose Ferguson was visiting in New York, and Letitia found so much to do to supply her place to her father and mother, that she had less time than usual to share with Grace. Then, again, the Elm-street cottage was a walk of some considerable distance; whereas, when Grace lived at the old homestead, the Fergusons were so near as to seem only one family, and were dropping in at all hours of the day and evening.
How long had the snow been falling?