The royal couple's developments at Sandringham were not confined to the house; over the course of their occupation, the wider estate was also transformed. Ornamental and kitchen gardens were established, employing over 100 gardeners at their peak. Many estate buildings were constructed, including cottages for staff, kennels, a school, a rectory and a staff clubhouse, the Babingley. Edward also made Sandringham one of the best sporting estates in England to provide a setting for the elaborate weekend shooting parties that became Sandringham's defining rationale. To increase the amount of daylight available during the shooting season, which ran from October to February, the Prince introduced the tradition of Sandringham Time, whereby all the clocks on the estate were set half an hour ahead of GMT. This tradition was maintained until 1936. Edward's entertaining was legendary, and the scale of the slaughter of game birds, predominantly pheasants and partridges, was colossal. The meticulously maintained game books recorded annual bags of between 6,000 and 8,000 birds in the 1870s, rising to bags of over 20,000 a year by 1900. The game larder, constructed for the storage of the carcasses, was inspired by that at Holkham Hall and was the largest in Europe.