Users report continuing with the same vial well past the 28-day mark, sometimes for months, as long as it remains clear and basic hygiene steps are followed. Storage in a cool dark place without refrigeration is common. No one in the thread describes discarding vials solely because of the 28-day guideline once they have experience with the product.
What this discussion establishesNothing here is advice.
The main point seems to be that it's still fine past 28 days, even though people talk about 60 days, provided you use a fresh needle and swab with alcohol every time.
I've kept using the same one without putting it in the fridge for months now, but only if it stays clear when I pull it into the syringe.
That video is interesting. Nobody I've seen throws it out after 28 days once they've been at this for a while. There are some good tests on degradation out there. There's also a solid study on Bac-Static with quantitative testing of how benzyl alcohol affects bacterial growth, covering what bacteriostatic and bactericidal mean and the role of the 0.9 percent concentration.
I just keep using mine until it's empty, keeping it in a dark cabinet inside the air-conditioned laundry room.
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