Between 5 and 9 days. Cant say how it develops after this as I have finished the roast. Love this bean though - Cocoa flavours really come through - great as a SO. Ill roast twice as much next time so I have some that lasts a little longer. I tend to always not have enough coffee roasted so I am always opening bags I swore I would leave for longer. How long since you roasted the beans?