The brand suggests 90 to 180 days to evaluate and guarantees 60 days. Here is what that looks like for each pack.
On the 2-bottle pack, the stated supply is 60 days, and delivery takes part of that, so you will always use less than 60 days of product inside the window. On the 3-bottle pack you have 90 days of product but a guarantee that ends at day 60. On the 6-bottle pack you have 180 days of product and a guarantee covering one third of it.
In every case you reach day 60 having completed between a third and two thirds of the brand's suggested evaluation period.
You are choosing at day 60 with partial information. Make that choice deliberately: decide in advance what change would justify continuing, track it from day one and keep your refund request ready. Our existing post on this gap goes deeper into why it is easy to miss.