I've been using Viori and have been on a subscription for shampoo and conditioner for over 3 years. As a single-use person and based on my hair's needs, I typically get shipped a shampoo bar every 3-4 months (depending how often I wash my hair), and conditioner every 5 months, as I typically just use it for the bottom half of my hair. Best part is you can always choose to skip the month if you think you're still good. Shipping is fairly quick, typically 5 business days. So be prepared to order ahead. Using Viori for so long, I've seen amazing improvements in my hair. Shinier, growth, fuller, and no more dry scalp and flakes. Love it.