its really impossible for someone to say exactly but what makes it hard for me to give you an estimate is how it looks. the bud underneath the rotted on the top looks frosty and healthy from what can be seen, but if determining harvest times are difficult by way of seeing the color of the hairs trych color may be your best bet. even the length of time may be thrown askew due to stress or weather or any number of things. i would do some "surgery" on the bad parts of the bud and pick the next highest healthy bud to go on trich color and use that as a guide. mind that the tops of the plant can mature faster than the lower buds. if you can get a close pic of the next highest healthy bud i could prob give an estimate but your eyes would be better than mine. hope this helps a bit. in this world of green of ours we learn to roll with the punches. good luck to you my friend