The single extensions usually last 3 – 5 months. – Single strand fine installation (where the standards are cut into 2 smaller pieces will last 6-8 weeks. -GL Apps usually lasts 4 – 8 weeks. However there are many factors which play a part – your hair type, whether fine extensions or standard single extensions were used, whether your hair is in the active/growing or inactive/dormant phase of growth/loss, the haircare products you use and how well you have maintained your extensions. We recommend every 4-6 weeks maintenance after the initial installation. It may be necessary to remove and replace a percentage of the extensions at each maintenance visit. Standard extensions tend to last longer than fine extensions.