Seed packaging will be a guideline, a very loose guideline. Even if all environmental variables were accounted for the times on packages will still be off usually. Definitely need to learn to let the plant tell you when shes ready, theres also the type of smoke you have, you could cut them early/"on time"/late for different types of highs So it really comes down to preference during those last week or two. Do you have a magnifying glass / jewelers loupe? Something with like 40x-120x magnification to be able to check the heads of the trichs