Mine flowered at almost exactly the four week mark. One was done at exactly 8 weeks of flowering and the second took like 9 weeks and a day or two.
90 days Sprout to harvest is a pretty good number, but every grow is different @jusgettinby
My BBA’s flowering at 4 weeks caught me off guard and I started them in larger yogurt cups and had to transplant them into three gallon bags but i got lucky. I would imagine your BBA’s should do better than my two that produced just more than an ounce total of dried bud.
the next grow, I expect to double that harvest!