Hair extensions need to be removed and refitted after 3 months obviously. Lush us hair will last 3 months, 4 at a push, some hair can last 6-9 it depends on the hair, some longer. Once the prebondes are melted and applied and removed with the solution, they are pretty much useless so needs pretipping again, same applies for stick tips if they are squashed or damaged by the micro rings. Different hair last different amounts of time.