Cluster and pre-mapped sets give 5 to 10 days of continuous wear. Half lashes last up to 5 days. Where you land in that range depends on your skin, your routine and how well the bond cured in the first two days.
Each set is designed for one application. Once removed, the pre-applied adhesive is spent, so you use a fresh set next time. Cluster boxes contain around five sets and pre-mapped and half lash packs contain three, so one box covers you for weeks without daily reapplying.
The things that shorten wear are getting the lashes wet in the first 24 to 48 hours before the bond has cured, oil-based products anywhere near the lash line, and rubbing the eyes. The things that extend it are properly oil-free prep, a good clamp on every cluster, and keeping the lash line dry while the bond sets.