At least 1 year due to seasoning requirements. And, IF a lender will due it prior to 1 year you can bet you pay big bucks for it.
Ultimately, what establishes the value of a property is what a seller is willing to sell it for and buyer is willing to able to pay for it. Thus, the underwriter will question the sudden appreciation of the property. In the current lending market I'd say be prepared that they might make you 'prove' the property has appreciated as much as you say it has.