Why 9 months? Well because no one gave a shit, not because it couldn't be fixed. I was handed the defect and saw there were over 150 customer reports attached to it. Total fix and test time? 4 minutes.
Asked around. Well the CEO was on fire about it, had lost several customers, had several $million on lost sales. Was anyone made responsible? No. And that's where the problem lies. Ownership and responsibility. It's up to that to come from the top down because as hard as you can try and own something from the bottom up, some asshole will no doubt screw it up somewhere in the chain of command.
Same thing at the last 4 companies I've worked at.