Four weeks is just an average. It can take the IRS 8 weeks or longer to process your tax return. Did you e-file your return? Or did you print, sign and mail it? You can check the current status at http://www.irs.gov/refunds.
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.