how long should i let it ripen a week or 2? I am in the 8th week of flowering sativa hawaii bank indicates 9-12 weeks

looks like you have some newer wave of growth developing. This adds a wrinkle. You have to weight letting older calyxes ripen extra long to get the new grwoth up to speed or take it down when the old growth is ready - and anywhere in between. Just keep scoping multiple locations and not just top colas. the trichomes are the best correlation to use. Don't let some preconceived notion dictate timing of harvest. Just mindlessly check the trichomes and react accordingly. If not sure what level of ripeness you prefer, shorten the learning curve. Take at least a few buds early, middle and late. LAbel with guesstimated %-amber at time you took them off... That'll help you consistently choose a time in the future for the results you like best.

The best way to know for sure is check the trichomes. Each cultivar may very on a number of factors like growing environment and stresses the plants have received in the flowering cycle. Best of luck on the rest of your growing endeavour.

If the seed bank recommends 9-12 weeks I would shoot for the full 12 weeks. That’s my opinion though.