How long does Wen shampoo last?

Could you please elaborate on the longevity of Wen shampoo? I'm curious to know how long a bottle typically lasts for regular users. Is it sufficient for a few weeks, months, or even longer? I'd like to get a sense of the value for money in terms of its durability and frequency of repurchasing. Also, does the longevity vary based on hair type, usage amount, or any other factors? Thank you for your insight.