anywhere between 3 days and 3 weeks.
the competition is not great for that actual phrase 238 in Google (including 2 of yours) (only 275,000 results).
What you need is to forget % utterly and get some structure into your pages. on the above results the title maybe a header and a couple of times in the body would rank quite well.
One thing you need to do is work on branding (Chris went through that with the "sensabilities" logo) and your "buy line" "care for the body...comfort for the soul" get it in some text in a few pages around the site.
work on the way you use "new jersey day spa". punctuation and some words are effectively ignored by the engines for ranking use.
so "new jersey day spa", "here in new jersey, a day spa may" plus many more variations seem the same to the algo.
cramming the exact same phrase to get a % density can have a opposite effect to what you expect. Obvious over-optimisation is beginning to get hurt a little by google.
Chris.
Indifference will be the downfall of mankind, but who cares?
A website that proves the cobblers kids adage.
Nightclub counting systems
So long, and thanks for all the fish.