i do the LCN too, they are also easier on your actual nails.
If i get a full set, with tips, it's 60, if they have the white tips, 50 for no white tips, and 40 for no tips and no whitetips. then its 45 for a fill with rewhitening, and 35 for just a fill, about every 3 weeks.
i used to have them a little longer, and at first it was a little harder, mainly because i was getting used to the nails.
but im having them done now, except im just getting the LCN over the nails i have, because my nails were really brittle and kept breaking down into the quick, this is keeping them strong enough.