How long can I keep a house under contract so I can find a buyer?

[Klyde Waggsdale]

I found a house that I might want to try and get under contract and then wholesale. About how long do I have to find a buyer from when I get the house under contract to when I the buyer is going to want me to close? I want to make sure that I have ample time to try and find a buyer. If I don't find a buyer I will just give up my earnest money and walk. Thanks for the help!