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