The entire length of the qin ( in Chinese measurements ) is 3 feet , 6.5 inches , representing the 365 days of the year ( though this is just a standard since qins can be shorter or longer depending on the period 's measurement standard or the maker 's preference ) . The entire length of the qin ( in Chinese measurements ) is 3 chi , 6 cun and 5 fen ; representing the 365 days of the year ( though this is just a standard since qins can be shorter or longer depending on the period 's measurement standard or the maker 's preference ) .