average Flower time for Grape Krush

Anybody with some hands on harvest times would be great. Thanx all

So I have read around and the average answer is 55-65 days like most strains. But it has been said to take as little as 45 days and as long as 70 depending on the phenotype. Heres mine at 31 days of 11.5-on/12.5-off. Not sure if I should be worried. The browning and yellowing accuring on GK is only happening to her, not my "21"s