7. Gels generally last 2-3 weeks. The best part about gel manis is how long they last. If you have a bunch of events coming up back to back like prom, internship interviews, and family vacays, gels can be the perfect solution because they last about two full weeks with no chipping. Keep in mind, thought, that how long they last does depend on your body chemistry, the product itself, and how it's applied. But however long your gel lasts, you'll love your nails the entire time.