Bio Sculpture will last three weeks on your nails and about six to eight weeks on toe nails, as they grow a lot slower than finger nails. Some clients may last longer as they look after and maintain their nails well and others client who are hard on their nails may only last two weeks.he Safety Agency have confirmed that the UV emissions of the Bio Sculpture Unit are predominately in the UVA region and our lamps are safe to use for the application of our gel as long as you do not exceed a maximum of 75 minutes per session.