When I should cut?

Hi, nice looking ladie pal. She's 17wks in right. By right she should be done no later than wk 20-22. Have you got a microscope or a decent mag? You need to check out the trichomes. What you are aiming to see is 70%-80%cloudy the rest amber no clear or milky white the rest will turn during your weeks flush? Then give a 36hr dark period, meaning let her sit it out in the dark all alone. And then bring to harvest. She looks nice, lots of bud mass to put on gaving a cloer look. but for a proper answer you need to check out the Trichomes. Good luck, happy growing!