3–5 years is a long time. If you have the aptitude and interest then it is advisable to drop for maximum 2 years. Mostly people clear in the 1st drop year with coaching or tuition. If you don’t qualify and are still keen on giving neet, give the 3rd attempt or else pursue another course.
5 years is too long a time. Not worth it, also not possible since maximum 3 attempts can be given