Extended flower stage??

Ive had some delays(negative plant stresses) and feel like I’m behind maybe 2-3 weeks of flower. My question is: can I extent bloomin/flowering stage to compensate for that lost time for flower development or at this point should I cut my losses and not extend the time to see it they bounce back a little. Right now they are in week 8 but look like week 5. Strain is Gorilla Glue. Stresses were late defoliating and some white powdery mildew.