Queen Elizabeth Pink Kush

In soil it is a 2 to 4 week period depending on how fertile the soil is. In coco or soil less it is 7 days from sprout. Is the simplest way to put it. Good luck.

Looks like nutrient burn to me. Flush it with PH 6.5 water with no nutrients and then and reduce the strength by half on the next feed. These look close to finishing anyway, so you may be thinking about flushing soon and perhaps don't want to give any more nutrients at all for the final week (?).