When someone talks about duration, it’s important to know what they mean
When someone talks about how long something lasts, it depends on what they mean. If you look at nasolabial fold correction, it may start to go away in as soon as 6 months. However, if you look at a biopsy of the product, you can find evidence of the product still present 5 years later (even though the appearance of the correction may be gone). So when someone talks about duration, it’s important to know what they mean.