(i) It is implied in this sentence that the ‘silver house’, is actually the moon in the sky.
(ii) It is implied in this sentence that the two weeks that are used to build the ‘silver house’ up are the weeks that are required for the moon to complete its journey from the ‘new moon phase’ to the ‘full moon phase’ (waxing).
(iii) It is implied in this sentence that the period of two weeks is the time taken by the moon to change from the ‘full moon phase’ to the ‘new moon phase’ (waxing).