What did you mail? Your W2 form or your tax return 1040.4 weeks after you print and mail it, you can start checking IRS Where's my refund <a rel="nofollow" target="_blank" href="https://www.irs.gov/refunds/">https://www.irs.gov/refunds/</a>
if you actually only sent the IRS your W-2, then you really haven't filed. The IRS gets copies of your W-2 from the Social Security Administration.