How long will one bottle of skinB5 Cleansers last? SkinB5™️ Help Centre (HQ) April 16, 2019 02:04 Updated That really depends on how much and how often you use the Acne Control Cleansing Mousse and Australian Botanicals Cleansing Mousse. The average is between 4 - 8 weeks. Related articles Can I use other topical products while using skinB5 Cleansers? Comments 0 comments Please sign in to leave a comment.