Yep, it's about 2 weeks, give or take a few days (at least for federal refunds). I'm imagine the closer we get to Apr. 15th, the longer that timeframe might get.
Go to www.irs.gov and on the front page there is a link that will let you enter your information and it will tell you where your refund is (received, being processed, sent) and the approximate date you should receive it.