The 8ml size lasts four months, using twice daily.Related ArticlesCan The Eyebrow and Lash Enhancing Serum be used under makeup?How often do I apply The Eyebrow and Lash Enhancing Serum?How long does the The Eyebrow and Lash Enhancing Serum last?Is The Eyebrow and Lash Enhancing Serum suitable for sensitive skin?How long will The Serum last?