Great! Thanks for the link - this is important stuff - really wish we could pin down how many months "months-long" means - and I'm sure there's more that's not said, as in these stability tests must be done at multiple temps because heat increases the rate at which things oxidize or break down:
It lasts for at least the same amount of time.
Most medicines break down, or deteriorate, over time. Generic drug companies must do months-long "stability tests" to show that their versions last for at least the same amount of time as the brand-name.
It is manufactured under the same strict standards as the brand-name medicine.
It meets the same batch requirements for identity, strength, purity, and quality. The manufacturer is capable of making the medicine correctly and consistently.