Ninety-to-180 days is the "sweet spot of flipping," according to a new report by First American Residential Solutions, one of the country's largest providers of property data. Hold a house any shorter or longer than that and you won't do nearly as well.

Of course, we're not talking about fraudsters who use false information to buy a house. Rather, we're talking about savvy investors who purchase distressed or undervalued properties, raise their value by making repairs or even remodeling or simply taking advantage of a hot and getting-hotter housing market.

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