The single thing that makes gel nails last is prep. Not the brand, not the lamp, not the colour. Everything that determines whether your manicure holds for three weeks or lifts by day eight happens in the ten minutes before you open the bottle, in steps most people skip.

BIAB lasts three to four weeks with professional application and consistent aftercare. That is the answer you came here for. But that range tells you almost nothing about why your last set lifted at ten days or why your client's holds perfectly for a month, and the difference between those two outcomes comes down to specific things that most nail technicians know and most clients are never told.

Builder gel that lifts early almost always fails at prep, curing, or product compatibility. Not the gel itself. Every nail technician knows those three areas matter. What this guide covers is the specific part of each one that gets skipped, and why skipping it costs you the result even when everything else is right.