That really depends on what kind of enhancement it is you are after, Probably the longest treatment wold be sculpted nails, the tips are applied using disposable forms rather that gluing a tip on, I would say this takes anywhere from just over an hour ( if the technician uses an e-file ) to around just over an hour and a half if using hand files, that's kind of a rough guide though, for overlays a set of coloured overlays can be done in about 30-40 mins, french overlays a bit longer as they are a bit more work, hope that hepled x ruth