A new home that is built during a given year is counted in that year's GDP, while the purchase of a previously owned house has already been counted in the GDP of the year it was constructed. In this way, only those residences that add to the overall housing stock count towards GDP.
For those who file an amended return, however, the period to receive a refund check will take 8-12 weeks. For efilers (e.g., those who file electronically) here is a refund cycle chart that gives target dates when either an electronic direct deposit or mailed paper check should be expected given a particular filing date.
State along with federal taxes usually take 14 to 21 days if electronically filed with Direct Deposit. You can receive your refund sooner. But this is the norm.