for you to get traffic from google? My site is almost 2 months old now, and i don't think i've recieved any traffic from google yet.
A lot of factors to figure in on how long it takes to get traffic from google. If your site is fairly new, do a search for 'google sandbox'. How competitive is your keyword? What is your position? Do you have a sexy title? (a title that will motivate people to click on it when people see your google listing) Are people searching for what you offer? Are you using appropriate anchor text on your links?
My last site took one week but it is a different kind of site to yours. The questions above by Christopher are the ones you need to look at.