Some state refunds can take quite a long time. There are over 40 state tax agencies, each doing its own thing. Some states are fairly quick with refunds, while other states (such as WV, WI, NC, GA, LA, AL, and others) can take a long time processing returns--even several weeks--as they crack down on detecting fraudulent returns. You may be able to get an idea about how long it takes in your state from a statement at your state's lookup tool or from the FAQs at your state's tax agency website.
The FAQ I left in my answer above will take you to your state's refund lookup tool.
