Ya that plant needs more time. If a strain says 7-9 weeks it will probably take 8-11 depending on pheno. You will know by the overwhelming smell and the changing in colour of the hairs that it's time to start looking at the trichs. If a strain says 8 weeks I will start checking trichs at 8 weeks even though they will still be clear and check them every few days to get a feel for how well they are ripening. Best advice I can give you is to get a good scope and go by trichs not time.