Any ideas on how long to harvest

I know it's kinda a dumb question, but anyone have an idea as to how much longer for these young buds? These flowers are just a little over a week old. It's Chrystal Rain under 400W HPS.

Seven to ten weeks depending on species. You can't tell when to harvest without looking at the trichomes with a magnifying glass and checking the ratio of cloudy thrichomes to amber thrichomes. When the ratio of cloudy to amber starts reaching 50/50 it is time to harvest.

The seed specs say 8-9 weeks for this variety, but they are often wrong. The only way to be sure is the thrichome ratio.