Drying time of leaves sample strongly depend upon the climatic conditions (temperature, relative humidity, air velocity), and thickness of the leaf beds. Higher temperature and lower relative humidity and thickness of beds will decrease the drying time.
shade or air dried leaf samples are very good in color, appearance and composition. it takes 3-4 days to dry leaf at shade or room with moisture 8-13%. i have dried taro and cassava leaf samples using room drying for 3 days.