I agree, after about 2 weeks they grow out quite a bit and don't look as good! It depends how quickly your own nails grow though! You can get away with leaving them longer but if you get them done on this sat they prob won't look that great by new years to be honest! If u get them done the following sat they may just stay looking good for new year.
I had my acrylic nails done yesterday and will get them done in 2 weeks time, in time for the weekend before christmas, my bday, christmas and new year!
x